# data[].attributes.body
Name:  Jeremy
Source: https://mocomi.com/what-is-electromagnetism/

What is an electromagnet?

An electromagnet is a magnet whose magnetic field is created when electricity is flowing. This type of magnet is different from the refrigerator magnets that you use to decorate your refrigerator. A refrigerator magnet is a kind of permanent magnet made of magnetic material that continuously generates a magnetic field. On the other hand, electromagnets are built and produce a magnetic field only when required.

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name Tristan
source https://kids.kiddle.co/Maglev_train

Electromagnets are similar to other magnets in that they attract metal ...

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Maglev (derived from magnetic levitation) is a system of train transportation that uses two sets of electromagnets: one set to repel and push the train up off the track, and another set to move the elevated train ahead, taking advantage of the lack of friction. Such trains rise approximately 10 centimetres (4 in) off the track. There are both high-speed, intercity maglev systems (over 400 kilometres per hour or 250 miles per hour), and low-speed, urban maglev systems (80-200 kilometres per hour or 50-124 miles per hour) under development and being built. The Shanghai maglev train is the only maglev train in commercial operation that can be considered as high speed.

Development

In the late 1940s, the British electrical engineer Eric Laithwaite, a professor at Imperial College London, developed the first full-size working model of the linear induction motor. He became professor of heavy electrical engineering at Imperial College in 1964, where he continued his successful development of the linear motor.

The linear motor was naturally suited to use with maglev systems as well. In the early 1970s, Laithwaite discovered a new arrangement of magnets, the magnetic river, that allowed a single linear motor to produce both lift and forward thrust, allowing a maglev system to be built with a single set of magnets.

The first commercial maglev people mover was simply called "MAGLEV" and officially opened in 1984 near Birmingham, England. It operated on an elevated 600 metres (2,000 ft) section of monorail track between Birmingham Airport and Birmingham International railway station, running at speeds up to 42 kilometres per hour (26 mph). The system was closed in 1995 due to reliability problems.

Technology

The two main types of maglev technology are:

Electromagnetic suspension (EMS), electronically controlled electromagnets in the train attract it to a magnetically conductive (usually steel) track.

Electrodynamic suspension (EDS) uses superconducting electromagnets or strong permanent magnets that create a magnetic field, which induces currents in nearby metallic conductors when there is relative movement, which pushes and pulls the train towards the designed levitation position on the guide way.

High-speed maglev comparison with conventional high-speed trains

Maglev transport is non-contact and electric powered. It relies less or not at all on the wheels, bearings and axles common to wheeled rail systems.

Speed: Maglev allows higher top speeds than conventional rail. While experimental wheel-based high-speed trains have demonstrated similar speeds, conventional trains will suffer from friction between wheels and track and thus elevating the maintenance cost if operating at such speed, unlike levitated maglev trains.

Maintenance: Maglev trains currently in operation have demonstrated the need for minimal guideway maintenance. Vehicle maintenance is also minimal (based on hours of operation, rather than on speed or distance traveled). Traditional rail is subject to mechanical wear and tear that increases rapidly with speed, also increasing maintenance. For example: the wearing down of brakes and overhead wire wear have caused problems for the Fastech 360 rail Shinkansen. Maglev would eliminate these issues.

Weather: In theory, maglev trains should be unaffected by snow, ice, severe cold, rain or high winds. However, as of yet no maglev system has been installed in a location with such a harsh climate.

Acceleration: Maglev vehicles accelerate and decelerate faster than mechanical systems regardless of the slickness of the guideway or the slope of the grade, because they are non-contact systems.

Track: Maglev trains are not compatible with conventional track, and therefore require custom infrastructure for their entire route. By contrast conventional high-speed trains such as the TGV are able to run, albeit at reduced speeds, on existing rail infrastructure, thus reducing expenditure where new infrastructure would be particularly expensive (such as the final approaches to city terminals), or on extensions where traffic does not justify new infrastructure. John Harding, former chief maglev scientist at the Federal Railroad Administration, claimed that separate maglev infrastructure more than pays for itself with higher levels of all-weather operational availability and nominal maintenance costs. These claims have yet to be proven in an intense operational setting and they do not consider the increased maglev construction costs. However, in countries like China, there are discussion of building some key conventional high-speed rail tunnels/bridges to a standard that would allow them upgrading to maglev.

Efficiency: Conventional rail is probably more efficient at lower speeds. But due to the lack of physical contact between the track and the vehicle, maglev trains experience no rolling resistance, leaving only air resistance and electromagnetic drag, potentially improving power efficiency. Some systems, however, such as the Central Japan Railway Company SCMaglev use rubber tires at low speeds, reducing efficiency gains.

Weight: The electromagnets in many EMS and EDS designs require between 1 and 2 kilowatts per ton. The use of superconductor magnets can reduce the electromagnets' energy consumption. A 50-ton Transrapid maglev vehicle can lift an additional 20 tons, for a total of 70 tons, which consumes 70-140 kilowatts (94-188 hp). Most energy use for the TRI is for propulsion and overcoming air resistance at speeds over 100 miles per hour (160 km/h).

Weight loading: High-speed rail requires more support and construction for its concentrated wheel loading. Maglev cars are lighter and distribute weight more evenly.

Noise: Because the major source of noise of a maglev train comes from displaced air rather than from wheels touching rails, maglev trains produce less noise than a conventional train at equivalent speeds. However, the psychoacoustic profile of the maglev may reduce this benefit: a study concluded that maglev noise should be rated like road traffic, while conventional trains experience a 5-10 dB "bonus", as they are found less annoying at the same loudness level.

Magnet reliability: Superconducting magnets are generally used to generate the powerful magnetic fields to levitate and propel the trains. These magnets must be kept below their critical temperatures (this ranges from 4.2 K to 77 K, depending on the material). New alloys and manufacturing techniques in superconductors and cooling systems have helped address this issue.

Control systems: No signalling systems are needed for high-speed maglev, because such systems are computer controlled. Human operators cannot react fast enough to manage high-speed trains. High-speed systems require dedicated rights of way and are usually elevated. Two maglev system microwave towers are in constant contact with trains. There is no need for train whistles or horns, either.

Terrain: Maglevs are able to ascend higher grades, offering more routing flexibility and reduced tunneling.

High-speed maglev comparison with aircraft

Differences between airplane and maglev travel:

Efficiency: For maglev systems the lift-to-drag ratio can exceed that of aircraft (for example Inductrack can approach 200:1 at high speed, far higher than any aircraft). This can make maglevs more efficient per kilometer. However, at high cruising speeds, aerodynamic drag is much larger than lift-induced drag. Jet-powered aircraft take advantage of low air density at high altitudes to significantly reduce air drag. Hence despite their lift-to-drag ratio disadvantage, they can travel more efficiently at high speeds than maglev trains that operate at sea level.

Routing: Maglevs offer competitive journey times for distances of 800 kilometres (500 mi) or less. Additionally, maglevs can easily serve intermediate destinations.

Availability: Maglevs are little affected by weather.

Travel time: Maglevs do not face the extended security protocols faced by air travelers nor is time consumed for taxiing, or for queuing for take-off and landing.

With maglev technology, the train travels along a guideway of electromagnets which control the train's stability and speed. While the propulsion and levitation require no moving parts, the bogies can move in relation to the main body of the vehicle and some technologies require support by retractable wheels at low speeds under 150 kilometres per hour (93 mph). This compares with electric multiple units that may have several dozen parts per bogie. Maglev trains can therefore in some cases be quieter and smoother than conventional trains and have the potential for much higher speeds.

Despite over a century of research and development, there are only six operational maglev trains today - three in China, two in South Korea, and one in Japan. Maglev can be hard to economically justify for certain locations, however it has notable benefits over conventional railway systems, which includes lower operating and maintenance costs (with zero rolling friction its parts do not wear out quickly and hence less need to replace parts often), significantly lower odds of derailment (due to its design), an extremely quiet and smooth ride for passengers, little to no air pollution, and the railcars can be built wider and make it more comfortable and spacious for passengers. And also because it can travel up higher ascending grades (up to 10 percent), compared to conventional trains (up to 4 percent or less), maglev trains can also reduce the need to create new tunnels or to level the landscape to build its tracks.

The highest-recorded maglev speed is 603 kilometres per hour (375 mph), achieved in Japan by JR Central's L0 superconducting maglev on 21 April 2015, 28 kilometres per hour (17 mph) faster than the conventional TGV wheel-rail speed record. However, the operational and performance differences between these two very different technologies is far greater. The TGV record was achieved accelerating down a 72.4 kilometres (45 mi) slight decline, requiring 13 minutes. It then took another 77.25 kilometres (48 mi) for the TGV to stop, requiring a total distance of 149.65 kilometres (93 mi) for the test. The L0 record, however, was achieved on the 42.8 kilometres (26.6 mi) Yamanashi test track - less than 1/3 the distance. No maglev or wheel-rail commercial operation has actually been attempted at speeds over 500 kilometres per hour (310 mph).

History of maglev speed records

Two incidents involved fires. A Japanese test train in Miyazaki, MLU002, was completely consumed by a fire in 1991.

On 11 August 2006, a fire broke out on the commercial Shanghai Transrapid shortly after arriving at the Longyang terminal. People were evacuated without incident before the vehicle was moved about 1 kilometre to keep smoke from filling the station. NAMTI officials toured the SMT maintenance facility in November 2010 and learned that the cause of the fire was "thermal runaway" in a battery tray. As a result, SMT secured a new battery vendor, installed new temperature sensors and insulators and redesigned the trays.

On 22 September 2006, a Transrapid train collided with a maintenance vehicle on a test/publicity run in Lathen (Lower Saxony / north-western Germany). Twenty-three people were killed and ten were injured; these were the first maglev crash fatalities. The accident was caused by human error. Charges were brought against three Transrapid employees after a year-long investigation.

Safety is a greater concern with high-speed public transport due to the potential for high impact force and large number of casualties. In the case of maglev trains as well as conventional high-speed rails, an incident could result from human error, including loss of power, or factors outside human control, such as ground movement caused by an earthquake.

Interesting facts about Maglev trains

The first relevant patent, U.S. Patent 714,851 (2 December 1902), issued to Albert C. Albertson, used magnetic levitation to take part of the weight off of the wheels while using conventional propulsion.

In 1912 French-American inventor Émile Bachelet demonstrated a model train with electromagnetic levitation and propulsion in Mount Vernon, New York.

Maglev systems have been much more expensive to construct than conventional train systems, although the simpler construction of maglev vehicles makes them cheaper to manufacture and maintain.

The Shanghai maglev train, also known as the Shanghai Transrapid, has a top speed of 430 kilometres per hour (270 mph). The line is the fastest operational high-speed maglev train, connecting Shanghai Pudong International Airport and the outskirts of central Pudong, Shanghai. It covers a distance of 30.5 kilometres (19 mi) in just over 8minutes. The launch in 2002 generated wide public interest and media attention in maglev for the first time.

Images for kids

MLX01 Maglev train Superconducting magnet bogie

The proposed Melbourne maglev connecting the city of Geelong through Metropolitan Melbourne's outer suburban growth corridors, Tullamarine and Avalon domestic in and international terminals in under 20 min. and on to Frankston, Victoria, in under 30 min.

In Spanish: Tren de levitación magnética para niños

# data[].attributes.body
name Tristan
source
https://kids.kiddle.co/Electromagnet

Electromagnets are temporary and artificial magnets. They are magnets that are only magnetic when there is a coil of wires

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Electromagnets are temporary and artificial magnets.They are magnets that are only magnetic when there is a coil of wire with electricity running through it. This is called a solenoid. The strength of the magnet is proportional to the current flowing in the circuit. The electricity running through the wire is called a current.

# data[].attributes.body
name Jeron
With magnets, opposite poles attract and like poles repel each other. This is the basic principle behind electromagnetic propulsion.

https://kids.kiddle.co/Maglev_train

# data[].attributes.body
name Jeron
With magnets, opposite poles attract and like poles repel each other. This is the basic principle behind electromagnetic propulsion.

https://kids.kiddle.co/Maglev_train

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2 interesting facts about electromagnet (Science)

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2 interesting facts about electromagnet (Science)

# data[].attributes.body
Name: Joel Teoh Kai Wen
URL:https://www.bbc.co.uk/bitesize/guides/z3g8d2p/revision/4
Fact: Electromagnets are magnet or magnetic materials operated with electricity. They are very powerful and are used in junkyards to carry heavy objects such as cars and trucks into a place so that they can be decomposed into new cars and trucks.

P.S. I didn’t really copy. I wrote by myself with all the facts I learned from books.

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They use 🧲 magnets to make products that we can use.

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Name Beren
Electro magnet is stronger than a normal magnet that is the advantages disadvantage is that it will take longer to make.
source

Electronics Tutorials

Electromagnet, Electromagnetic Coil and Permeability

Visit

Images may be subject to copyright. Learn More

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t can be turned on and off by cutting of the electrical current. It does minimal harm to the human body because it's not using x-rays like an x-ray does. It is easy to use and can help is many medical and casual things. Electromagnetism is the reason why we can

t can be turned on and off by cutting of the electrical current. It does minimal harm to the human body because it's not using x-rays like an x-ray does. It is easy to use and can help is many medical and casual things. Electromagnetism is the reason why we can
https://www.bing.com/images/search?view=detailV2&ccid=lvclNWSI&id=71E51D6ED59B0F8C017C47495F9532C510211F92&thid=OIP.lvclNWSIMZkJ5J1Rt8gCKwHaG5&mediaurl=https%3a%2f%2fwww.radicalindia.com%2fimages%2flarge%2fSL%2fel-2.jpg&exph=1500&expw=1610&q=+electromagnet&simid=607996347961127488&FORM=IRPRST&ck=5397A0AD6130C1F9F820C8F88F932B4D&selectedIndex=4

Name :Hasef

# data[].attributes.body
Name : Chloe Chia Yi Fei
source: https://kids.kiddle.co/Electromagnet

Electromagnets are temporary magnets. They are magnets that is only when there is a coil of wire with electricity through it.

# data[].attributes.body
name Beren
source: I couldn't find the source

1st It helps in daily life
2nd an electro magnet is a very strong magnet that can attract thing further than usual

# data[].attributes.body
Name: Chloe Chia Yi Fei
Source:https://kids.kiddle.co/Crane_(machine)
Cranes are commonly in the transport industry for the loading and unloading freights, in the construction industry for the movement of materials, and manufacture industry for heavy equipment.

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1.  What are the advantages and disadvantages of using electromagnets at work?2.  1 to 2 interesting fact(s) about electromagnets that you would like to share. 

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1.  What are the advantages and disadvantages of using electromagnets at work?2.  1 to 2 interesting fact(s) about electromagnets that you would like to share. 

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Light carries information in ways you may not realize. Cell phones use light to send and receive calls and messages. Wireless routers use light to send pictures of cats from the internet to your computer. Car radios use light to receive music from nearby radio stations. Even in nature, light carries many kinds of information.

Telescopes are light collectors, and everything we know from Hubble is because of light. Since we are not able to travel to a star or take samples from a faraway galaxy, we must depend on electromagnetic radiation — light — to carry information to us from distant objects in space.

The Hubble Space Telescope can view objects in more than just visible light, including ultraviolet, visible and infrared light. These observations enable astronomers to determine certain physical characteristics of objects, such as their temperature, composition and SPEED

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what are the advantages and disadvantages  of using electromagnetism.

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what are the advantages and disadvantages  of using electromagnetism.

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One advantage to use and electromagnetic energy source is that the electromechanical device used, you don't need an external electrical source to generate electrical power.

One disadvantage Electromagnetic power can be dangerous to use, for instant if you need to have a power source that must have a regulated current output, both AC and DC power generators would need to be run at a non-varying speed.

source :
https://sciencing.com/advantages-disadvantages-ac-generators-5783965.html

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Magnets come in 4 flavors - One example :
Ferromagnets which include substances like iron and nickel. They make good permanent magnets. Another type of magnet called ferrimagnets and only some of the electron spins are aligned.

Read More Source
https://www.livescience.com/47383-cool-facts-about-magnets.html

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Credit: Lena Lir / Shutterstock.com

The line "f-ing magnets, how do they work?" was coined in 2009 by the hip-hop duo Insane Clown Posse. Magnets aren't really all that mysterious - the basics have been known for two centuries. As a basic component of disk drives, magnets are part of just about every laptop or desktop computer, and they have made their way into tape players and, of course, the things we use to hold stuff on a fridge. Before the advent of flat screens, televisions and monitors were home to some of the most powerful magnets in the average home.

Although the physics of magnets are pretty well-understood (except perhaps by some hip-hop musicians), and they've been part of our lives for centuries, they do surprise and delight. Here's a look at some fascinating facts about magnets.

1. Magnets come in four flavors: Ferromagnets - which include substances like iron and nickel - are composed of atoms with unpaired electrons whose spins are aligned. They make good permanent magnets. In another type of magnet - called ferrimagnets - only some of the electron spins are aligned.

Maglev train starts operation on June 1, 2010.

Credit: Hung Chung Chih Shutterstock.com

Most chemical elements, however, are considered paramagnetic, meaning they are magnetized only when inside another magnetic field. Paramagnets also boast unpaired electrons.

If you're looking to levitate objects, diamagnetic materials are the way to go. These materials are magnetized when in a field, but they generate fields opposite to the one in which they are located. Maglev trains work on this principle.

2. Magnetism is light: Why do magnets stick? Magnets attract each other because they exchange photons, or the particles that make up light. But unlike the photons streaming out of a desk lamp or reflecting off of everything you see around you, these photons are virtual, and your eyes (or any particle detector) can't "see" them. They can, however, exchange momentum, and this is why they stick to things or repel them. When a kid throws a dodge ball, they're exchanging momentum with the ball, and the thrower feels a slight push back. Meanwhile the target person feels the force of the ball, and (maybe) gets knocked over - they are "repelled" from the thrower. With photons, the process can also happen in reverse, as though one kid reached out and grabbed the ball while the other was still hanging on to it, which would look like an attractive force.

Photons are the force carriers not only for magnets but also for electrostatic phenomena like static electricity, and it's why electromagnetism is the term we use for effects produced by these phenomena - including light, which is an electromagnetic wave.

3. Magnetism is relativistic: That's right - whenever you turn on an electromagnet and stick it to a fridge, you are demonstrating relativity. Why? According to the theory of special relativity, the distance along the direction of motion gets shorter - that is, a fast-moving car would look squished, even though the person in the car wouldn't notice. That person would see everything around him or her as squished in the direction in which the individual was traveling.

This has consequences for charged particles in wires. Ordinarily, the negatively charged electrons and positively charged protons in a wire cancel each other out. But when current moves through a wire, the electrons are moving. From the point of view of any stationary charged particle outside the wire, the distance between electrons gets smaller. That means it looks like there are more electrons than protons in a given space - all of a sudden there's a net negative charge. Put any positively charged particle (or wire) next to the wire with current in it, and you feel a magnetic force of attraction. Put a negatively charged particle near it and it will repel - and this is why if you run the current in opposite directions through two wires, they will attract each other, and if the current is running in the same direction, they will repel.

A similar thing happens when a charged particle moves through a magnetic field, say, near a (permanent) bar magnet . The particle experiences force. But according to the theory of relativity, you can't say that the particle is moving and the magnet isn't. From the point of view of the particle, the bar magnet is moving. Maxwell's equations, which describe electromagnetic waves and forces, show that you'd see different forces, depending on which reference frame you choose. For a stationary observer it looks like a magnetic force pushing or pulling on the particle, and for a moving one it's an electrostatic force. This problem was a major piece of Einstein's development of special relativity, which accounted for the discrepancy.

4. The world's most powerful magnets: The two biggest magnets reside at Los Alamos National Laboratory in New Mexico and Florida State University (FSU). The two sister laboratories have magnets that can reach 100 and 45 tesla, respectively. By comparison, junkyard magnets - the ones that lift cars - are about 2 tesla.

The 45-tesla hybrid magnet, looking up toward magnet, with detail of coldwater pipes at Florida State University.

Credit: National High Magnetic Field Laboratory, FSU

The Los Alamos magnet is designed to generate fields that last only a few seconds, while the FSU magnet can maintain its fields for as long as the power is on. Each magnet is designed to perform different kinds of experiments, noted Ross McDonald, a staff scientist at Los Alamos.

An interesting effect happens with the FSU magnet when there are diamagnetic materials, such as an aluminum canister, around. The diamagnetism creates fields with an opposite orientation to the magnet, so anything made of such materials is stuck in place. "It's like trying to move it through molasses," McDonald said.

It's not safe to play with aluminum canisters near the Los Alamos magnet, for the same reason that it isn't safe to stand in the room in which the magnet is housed. "Every pulsed magnet will eventually destroy itself," McDonald said, because of the stresses of the magnetic forces on the coils. When they fail, they can fail catastrophically. "We have something like 100 sticks of dynamite's worth of energy in there and we contain 99.9 percent of it," he said. But that last percentage point is still a lot, so LANL evacuates the building when its magnet is on.

5. Magnets showed that quantum mechanics worked: The discovery of one of the fundamental quantum mechanical properties of elementary particles - spin - involved magnets. It's called the Stern-Gerlach experiment, after physicists Otto Stern and Walter Gerlach. They conducted the experiment in 1922, to test ideas about the then-new theories of quantum mechanics. They used two magnets, one on top of the other, each shaped to produce a long, asymmetrical magnetic field. They then fired uncharged particles - silver atoms - through the field at a target. The asymmetrical field will alter the silver atoms' trajectory slightly. , Since the atoms will be oriented in random directions and their angular momenta will also be random, the trajectory should be different for each silver atom, but it was not known by how much. The target should have shown a smooth distribution of hits from one end to the other.

That didn't happen. Instead, the experimenters got two clusters of hits, as though the beam had split into two directions with the particles unable to deflect to anywhere in between. Stern and Gerlach had just demonstrated that particle spins were quantized - they can be up or down, but nothing else.

6. Magnets don't have to be iron or even metal: Most of the magnets we use are made of iron (like fridge magnets). But that doesn't have to be so. Magnets can be made of any material with unpaired electrons. That includes many metals and alloys, such as neodymium, which is used in disk drives. Ferrimagnetic materials, in fact, are often not metals at all. Among them are spinels, which are used in the magnets that seal refrigerator doors.

7. Magnetic medicine: There isn't any evidence that magnets work for pain relief. The reason? Even though there is iron in your blood, it's made up of atoms that are too far apart and too diffuse for magnets to affect them. If you tested this by pricking your finger and spilling blood near a magnet, you'd find that neither your blood nor the magnet would attract one another. [ 11 Surprising Facts About the Circulatory System]

That said, magnets are used in magnetic resonance imaging machines, which use magnets stronger than the ones in junkyards that lift cars. In most cases MRI magnets are superconducting and cooled with liquid helium.

8. Long known, but not understood: The ancient Greeks and Chinese noticed something was up with certain materials, known as lodestones. Lodestones were actually magnetite, a form of iron oxide that forms when magma cools slowly. The lodestones attracted other ironlike metals, and even better, could magnetize ordinary iron. When small pieces of metal were magnetized, then hung from a string or floated in water, they aligned with the Earth's magnetic field - becoming the first magnetic compasses.

9. Animals sport magnets: Some animals and bacteria have magnetite in their bodies. A type of mollusk called a chiton even has magnetite in its "teeth," which actually cover its tongue. The magnetite is abrasive and lets the animal scrape algae, but it might also provide a homing sense, enabling chitons to find their way back to certain places where they like to mate and feed. Studies of homing pigeons seem to show that they have a magnetic sense that helps them navigate. Magnetite in the animals' beaks seems to be the key, though how big a role that magnetic sense (called magnetoception) plays is unclear.

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The line "f-ing magnets, how do they work?" was coined in 2009 by the hip-hop duo Insane Clown Posse. Magnets aren't really all that mysterious - the basics have been known for two centuries.

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Electromagnet is another kind of magnet 

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Source : https://m.kiddle.co/s.php?q=how+does+a+electromagnet+work#gsc.tab=0&gsc.q=how%20does%20a%20electromagnet%20work&gsc.page=1
Name: Grace

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Source: https://m.kiddle.co/s.php?q=what+are+some+of+the+industries+that+make+use+of+electromagnets#gsc.tab=0&gsc.q=what%20are%20some%20of%20the%20industries%20that%20make%20use%20of%20electromagnets&gsc.page=1

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By: Janelle Ho (3F)
Electromagnets are temporary magnets that are made out of batteries and wire. Electricity passes through the electromagnets and allows the magnetic material that is connected to the batteries to become a temporary magnet.

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What are some industries that make use of electromagnets

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What are some industries that make use of electromagnets

# data[].attributes.body
By: Janelle Ho (3F)

Electromagnets can be used in a scrapyard to separate scrap iron and steel from the rest of the scrap.
Electromagnets are also used in school electric bells in most schools.

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name :Thanvi
source:
https://kids.kiddle.co/Electromagnet

Electromagnets act as temporary magnets when a coil of wire running on electricity.

when the number of batteries increase, the magnetic field around the materials is also increased making the electromagnets stronger.

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Source: https://monroeengineering.com/blog/how-does-an-electromagnet-work
How does an electromagnet work: When electricity moves, it creates a magnetic field. Electricity will flow through the wire, and produce a magnetic field.

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Source: https://www.sg.endress.com/en/field-instruments-overview/flow-measurement-product-overview/Electromagnetic-flowmeters
Electro flowmeters are applicable for all liquids, such as water and many others.

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BY:AARIFF

electro magnets are controlable
source:https://monroeengineering.com/

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What are the advantages and disadvantages of using electromagnets?

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What are the advantages and disadvantages of using electromagnets?

# data[].attributes.body
Name: Kayden Ng
Source: https://www.google.com/search?q=What+are+the+advantages+and+disadvantages+of+using+electromagnets

Disadvantages: Disadvantages of electromagnets is it will heat up very fast due to conduct of heat. This heat generation will lose of electrical energy . Maintaining its constant invisible magnetic field.

Advantages: The main advantages of an electromagnet , a permanent magnet is that the invisible magnetic field can be very fast being changed by controlling the amount of electricity in the winding. A permanent magnet that do not need power, the electromagnet requires a permanent continuous supply, current to maintain the magnetic field.

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This is called an electromagnet.This are the steps to make an electromagnet
1.coil a long piece of wire around the iron nail at least 20 times
2.Connect both ends of the wire to a battery.
3.Test to see if the iron nail can attract any small magnetic object.
Name:Naura Aamily

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Electromagnets can be used or found from a telephone or other iron things.
Name:Naura Aamily

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2 interesting facts about electromagnetism

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2 interesting facts about electromagnetism

# data[].attributes.body
Name: Kayden Ng
Source:
https://www.google.com/search?q=interesting+facts+about+electromagnetism

1]: Electromagnetism is a two link between electricity and magnetism. An electric
current makes a invisible magnetic field, and a normal magnetic field, when it is being change, it will create a voltage. The discovery of this link led to the invention of electric motorcycle, generators and others

Source:
https://www.apexmagnets.com/news-how-tos/8-strange-facts-about-magnets-and-magnetism/

2]: Magnets have two poles , if you cut them in half. Magnets will have two poles, a  North pole and South pole.  If we take a bar magnet and cut it in half, the two remaining pieces will still have a North and a South. You can cut it dozens of times and the results will be the same.

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Our magnets with low irreversible flux loss have stable flux under high temperature. Our magnets with low weight loss maintain a high performance during the whole lifetime. 15+ Invention Patents. ISO14001, ISO45001. 24+ years experience. offer One-Stop Production.

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Electric doorbells are commonly found around us. The magnetic field cause by the electromagnet is then used to power a machine that creates the doorbell sound.

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1. Used in MRI Machines - MRI machines are medical imaging devices that are used to diagnose injuries and illnesses in people.

2.  Adjustable Power Level - The power of their magnetic field can be adjusted by increasing or decreasing the amount of electricity flowing through the wire coils. The more electricity that flows through the wire coils, the stronger the magnetic field will be. Permanent magnets don’t offer an adjustable power level. They produce the same, consistent magnetic field at all times.

Name  : Jun Yi

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Electromagnets have some advantages over permanent magnets. They can be turned on and off. The strength of the magnetic field can be varied.

Disadvantages of using electromagnets will  lose of electrical energy very  much. Because they heat up very fast.

Jun Yi

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It always points to the south north direction when it come to rest.The poles of the magnets are stronger.
Hakim.

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Magnets are for pepole hwo needs to get something very far.
Hakim.

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Thanvi
3F.
Source   https://www.sg.endress.com/en/field-instruments-overview/flow-measurement-product-overview/flowmeters

electro magnets are used in telephone
factories. They are used carry heavy or bulky things.

electro magnets are used in telephone
factories. They are used

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Proven flow measuring technology for all electrically conductive liquids in every industry

Electromagnetic flowmeters have been used throughout industries for more than 60 years. These meters are applicable for all conductive liquids, such as water, acids, alkalis, slurries and many others. Typical applications are monitoring of liquids, filling, dosing and precise measurement in custody transfer. The two million magmeters we've sold since 1977 need no maintenance and offer seamless system integration into your processes.

In the industrial environment, electromagnetic flowmeters are primarily used in water management and in the processing, life sciences and food industries. In tunnel construction and mining, robust magmeters are often the only option for measuring highly abrasive ore slurries with entrained solids, sand-water mixtures, filler materials or bulk solids with the required accuracy.

Electromagnetic flow measuring principle

Faraday's law of induction states that a metal rod moving in a magnetic field induces electrical voltage. This dynamo principle also governs the way electromagnetic flowmeters work.

As soon as the electrically charged particles of a fluid cross the artificial magnetic field generated by two field coils, an electric voltage is induced. This voltage, tapped by two measuring electrodes, is directly proportional to the velocity of flow and thus to the flow volume.

The magnetic field is generated by a pulsed direct current with alternating polarity. This ensures a stable zero point and makes the flow measurement insensitive to multiphase or inhomogeneous liquids, as well as low conductivity.

Benefits

The measuring principle is virtually independent of pressure, density, temperature and viscosity

Even fluids with entrained solids can be metered, e.g. ore slurry or cellulose pulp

Wide range of nominal diameters (DN 2 to 2400; 1/12 to 90")

Free pipe cross-section: CIP/SIP cleanable, piggable

No moving parts, maintenance-free

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Proven flow measuring technology for all electrically conductive liquids in every industry Electromagnetic flowmeters have been used throughout industries for more than 60 years. These meters are applicable for all conductive liquids, such as water, acids, alkalis, slurries and many others. Typical applications are monitoring of liquids, filling, dosing and precise measurement in custody transfer.

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Electromagnets

When an electric current flows in a wire it creates a magnetic field around the wire. By winding the wire into a coil we can strengthen the magnetic field. Electromagnets are made from coils like this.

We can make an electromagnet stronger by:

wrapping the coil around an

iron core

adding

more turns

to the coil

increasing the current

flowing through the coil

A coil of wire wrapped around a nail connected to a battery and switch

The magnetic field around an electromagnet is just the same as the one around a bar magnet. It can, however, be reversed by turning the battery around. Unlike bar magnets, which are permanent magnets, the magnetism of electromagnets can be turned on and off just by closing or opening the switch.

Relays are electrically operated switches. They use an electromagnet, often to control a high-power circuit using a low-power signal or where multiple circuits need to be controlled by one circuit.

By Bryan Chia

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When an electric flows in a wire it creates a magnetic field around the wire. By winding the wire into a coil we can strengthen the magnetic field. Electromagnets are made from coils like this.

We can make an electromagnet stronger by:

The magnetic field around an electromagnet is just the same as the one around a bar magnet. It can, however, be reversed by turning the battery around. Unlike bar magnets, which are permanent magnets, the magnetism of electromagnets can be turned on and off just by closing or opening the switch.

Relays are electrically operated switches. They use an electromagnet, often to control a high-power circuit using a low-power signal or where multiple circuits need to be controlled by one circuit.

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Electromagnets - Electromagnets and motors - GCSE Physics (Single Science) Revision - Other - BBC Bitesize

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When an electric flows in a wire it creates a magnetic field around the wire. By winding the wire into a coil we can strengthen the magnetic field. Electromagnets are made from coils like this. We can make an electromagnet stronger by: The magnetic field around an electromagnet is just the same as the one around a bar magnet.

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A magnet and a coil of wire can be used to produce an electric current. A voltage is produced when a magnet moves into a coil of wire. This process is called electromagnetic induction. The direction of the induced voltage is reversed when the magnet is moved out of the coil again. It can also be reversed if the other pole of the magnet is moved into the coil.

If the coil is part of a complete circuit then a current will be induced in the circuit.

Notice that no voltage is induced when the magnet is still, even if it is inside the coil.

To increase the induced voltage:

move the magnet faster

add

more turns

to the coil

increase the strength of the magnet

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2 interestining facts about electromagnetism

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2 interestining facts about electromagnetism

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Electromagnets are controllable. This is one of the features that distinguish them from traditional, solid magnets. Other magnets generate a permanent magnetic field. The magnetic field is generated by the ferromagnetic material of which they are comprised. Electromagnets are different because they only generate a magnetic field when electricity flows through the wire coils. By disrupting the flow of electricity through the wire coils, the magnetic field can be disabled.

Another unique feature of electromagnets is an adjustable power level. The power of their magnetic field can be adjusted by increasing or decreasing the amount of electricity flowing through the wire coils. The more electricity that flows through the wire coils, the stronger the magnetic field will be. Permanent magnets don’t offer an adjustable power level. They produce the same, consistent magnetic field at all times. by bryan chia

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Name: Low Ooi Yuen

Source:
https://kids.kiddle.co/Image:Flux_compression_generator_1.png

A hollow metal tube athat is covered with wire  of explosively pumped flux compression.

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Name:Low Ooi Yuen
Source:https://kids.kiddle.co/Maglev_train

Electromagnets are similar to regular magnet , but they can be turned on and off.