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12. Discovery of Electromagnets- Foundation of modern physics

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12. Discovery of Electromagnets- Foundation of modern physics

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Hans Christian Orsted
Andre- Marie Ampere

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Discovery of Electromagnetism . Hans Christian Ørsted made this famous observation public in 1819.

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Check us out at http://www.tutorvista.com/content/physics/physics-i/magnetism/magnetic-keepers.php If two magnets are placed side by side due there will be mutual attraction or repulsion due to the produced magnetic field. To overcome this problem a ferromagnetic bar is placed across the poles of a permanent magnet. This ferromagnetic substance is called a magnetic keeper or magnet keeper.

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Magnet- is a body having the property of attracting ferromagnetic materials (such as steel and iron) and producing a magnetic field external to itself
Permanent magnets
remains magnetized even if there's no magnetic field
used for a wide variety of applications (starting with a refrigerator magnets and ending with electromechanical devices)
do not require any power source
environmentally friendly (natural)
Temporary magnets
What types of magnets do we know?
(magnets can be separated into several categories based on the properties like composition and source of magnetism)

Bibliography:

1) Types of Magnets (2015)
http://www.thomasnet.com/articles/electrical-power-generation/magnet-types
2)Permanent Magnets vs Electromagnets (2015, Adams Magnetic Products Co.)
http://www.adamsmagnetic.com/magnetic_assemblies/permanent-magnets-vs-electromagnets.php
3)What Are Permanent Magnets?
http://www.tech-faq.com/permanent-magnets.html
4) Two Advantages of an Electromagnet Over a Permanent Magnet (2015, Samuel Markings)
http://www.ehow.com/info_8208293_two-electromagnet-over-permanent-magnet.html
Advantages and disadvantages of different types of magnet
by Aida Ablayeva, 9 "E"
permanent
temporary
electromagnets
retain their magnetism once magnetized
act like permanent magnets within a strong magnetic field, but lose magnetism once the field disappears
wound coils of wire that perform like usual magnets when an electrical current is passed through
Electromagnets
advantages
disadvantages
disadvantages
advantages
disadvantages
NISA,
Astana city 2015
can be turned on and off with a simple switch
widely used (especially, in medicine and cargo lifting)
can be strengthened and weakened easily
do not turn on and off like electromagnets do
the magnetic field strength cannot be changed
the magnetic field is not very strong
demagnetize (temperature, hammering, alt. current, time)
must be continuously connected to a power source
dependent of the current and number of coils
Aim- provide you general information about different types of magnet and identify which of them has the best properties
Problem- lack of knowledge improper use
advantages
Physics
weak magnetic field
don't act without a magnetic field around
the magnetization does not last long
don't have multiple applications
(can be considered as temporary)
retain magnetic properties for a while
magnetized for a little period of time
Which one is the most beneficial?
Electromagnet

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Advantages and disadvantages of different types of magnet

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Magnet- is a body having the property of attracting ferromagnetic materials (such as steel and iron) and producing a magnetic field external to itselfPermanent magnetsremains magnetized even if there's no magnetic fieldused for a wide variety of applications (starting with a refrigerator magnets and ending with electromechanical devices)do not require

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11.Single and double touch methods, electrical method, electromagnets -uses, Demagnetistion

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11.Single and double touch methods, electrical method, electromagnets -uses, Demagnetistion

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2.single and double touch methods

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1.MAGNETIC INDUCTION METHOD

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Magnetic Field Demonstrations Simple Wire Coils

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Magnetic Induction Magnetic Induction is the process by which a magnetic substance is magnetised temporarily under the influence of a magnet. Here is an activity to demonstrate magnetic induction. Fix a soft iron bar on a clamp stand, spread some iron filings the other soft iron rod.

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Flipped classroom

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If you're lost in the woods, your best chance of finding your way might be a tiny magnet.

A magnet is what makes a compass point north -- the small magnetic pin in a compass is suspended so that it can spin freely inside its casing and respond to our planet's magnetism.

A compass needle aligns itself and points toward the top of Earth's magnetic field, giving explorers and lost souls a consistent sense of direction.
How it works
A compass points north because all magnets have two poles , a north pole and a south pole, and the north pole of one magnet is attracted to the south pole of another magnet. (You may have seen this demonstrated by a pair of simple bar magnets or refrigerator magnets pushed end to end.)

The Earth is a magnet that can interact with other magnets in this way, so the north end of a compass magnet is drawn to align with the Earth's magnetic field. Because the Earth's magnetic North Pole attracts the "north" ends of other magnets, it is technically the "South Pole" of our planet's magnetic field.
True north
While a compass is a great tool for navigation, it doesn't always point exactly north. This is because the Earth's magnetic North Pole is not the same as "true north," or the Earth's geographic North Pole . The magnetic North Pole lies about 1,000 miles south of true north, in Canada.

And making things even more difficult for the compass-wielding navigator, the magnetic North Pole isn't even a stationary point. As the Earth's magnetic field changes, the magnetic North Pole moves. Over the last century, it has shifted more than 620 miles (1,000 kilometers) toward Siberia, according to scientists at Oregon State University.

This difference between true north and the north heading on a compass is an angle called declination. Declination varies from place to place because the Earth's magnetic field is not uniform it dips and undulates.

These local disturbances in the field can cause a compass needle to point away from both the geographic North Pole and the magnetic North Pole. According to the United States Geological Survey, at very high latitudes , a compass needle can even point south.

By using charts of declination or local calibrations, compass users can compensate for these differences and point themselves in the right direction.
Got a question? Email it to Life's Little Mysteries and we'll try to answer it. Due to the volume of questions, we unfortunately can't reply individually, but we will publish answers to the most intriguing questions, so check back soon.

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Molika Ashford - Life's Little Mysteries Contributor

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If you're lost in the woods, your best chance of finding your way might be a tiny magnet. A magnet is what makes a compass point north -- the small magnetic pin in a compass is suspended so that it can spin freely inside its casing and respond to our planet's magnetism.

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a) EVERY MAGNET HAS TWO POLES- NORTH AND SOUTH
b) THE MAGNETIC FORCE OF A MAGNET IS STRONGEST AT THE POLES AND WEAKEST IN THE MIDDLE..

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Magnetism - CBSE NCERT Class VI Science lesson

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Repulsion occurs only between  like poles of any two magnets. This repulsion property of the poles can be used to  identify a magnet  from other magnetic substances.

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THE PROPERTY BY WHICH A MAGNET ATTRACTS IRON TOWARDS IT IS KNOWN AS MAGNETISM.

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IT IS A SUBSTANCE OR OBJECT HAVING THE PROPERTY OF ATTRACTING CERTAIN SUBSTANCES.