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magnetic ruler is made out of steel.Elina Yong(8)

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You can tell how many magnets a doorbell contains simply by listening to the number of tones it produces.  The solenoid in a doorbell causes a spring-loaded piston to strike a bell. It happens twice, because as you release the button the magnet passes beneath the piston again causing it to strike. This is where the "ding dong" sound comes from. Doorbells that have more than one tone have more than one chime, piston and magnet.

Lucas Ritchie (25)

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Televisions have magnets inside of them that make them work. These cathode ray tubes have an electron gun in the neck of the tube that shoots a stream of electrons toward the screen. Normally these electrons travel in a straight line and strike the screen at a central spot.

But powerful electromagnets in the tube's neck deflect the electrons toward the top or bottom and left or right sides of the tube. The inside of the screen has a special coating that glows when the stream of electrons strikes it. In this way, magnets help us see images on the TV screen.

Lucas Ritchie (25)

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Refrigerators and freezers are sealed with a magnetic mechanism so they’re easy to open from the inside.

A refrigerator uses a magnetic strip in its door. All refrigerators must seal to lock out the warm air and keep cool air inside. A magnet is what allows these seals to be so effective. The magnetic strip runs the length and width of the refrigerator and freezer door.

Lucas Ritchie (25)

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The doors to many medicine cabinets have a magnetic latch. A magnetic latch consists simply of a permanent magnet in the cabinet and a metal piece on the door. The magnet has just enough force to hold the door shut and opens easily when you pull on it. The magnetic refrigerator door seal replaced mechanical door latch mechanisms in the late 1950s as a safety measure.

Megan Lim (27)

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The speakers in your stereo contain magnets. The speaker consists of a stationary magnet in a metal frame, a paper diaphragm and a wire coil molded into the diaphragm’s center. When an electric current flows through the coil, magnetic forces between the coil and the stationary magnet make the diaphragm vibrate in and out. The vibration produces the music you hear. Almost every kind of speaker has a magnet, from tiny earbuds to large loudspeakers.

Megan Lim (27)

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A compass uses a magnet to direct its needle to the north pole. This is why magnets are said to have a north and south pole. The side that is attracted and points to the north is called the north pole, while the other end is the south pole. Children can easily learn about magnets in a compass by crafting one with a needle, cork and a bowl of water. Magnetize the needle by rubbing it with a strong magnet. Then, place the needle on top of a cork floating in water. It will point to the north.

Ashleigh

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The Telephone
A telephone sends sound waves as electrical current, which the receiving phone then re-converts into sound waves by causing a speaker membrane to vibrate, according to the Cornell Center for Materials Research.

Permanent Magnet

The telephone's speaker contains a permanent magnet--one that retains its magnetism constantly. The "north" on this magnet points toward the speaker membrane.

Electromagnet

The wire coil that carries electrical current to the speaker works as an electromagnet, becoming charged with magnetism only when current travels through it.

Interaction

As the electrical current travels through the wire, the wire magnetizes and demagnetizes many times per second, interacting with the permanent magnet to push and pull the speaker membrane into vibration.

Frequency Reproduction

To reproduce natural sound frequencies, the speaker membrane must vibrate at a certain number of cycles per second, requiring the magnetic field to change direction at the same frequency. The pitch "A," for instance, requires 440 magnetic-field reversals per second.

Ashleigh

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Coins are separated and sorted inside vending machines with magnets. These magnets sort out metal disks or slugs from the real coin money. Also, paper money and checks have magnetic dust in their ink. Vending machines and currency counters check the money for its magnetism to insure the money is genuine.
Ashleigh

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Many computers use magnets to store data on hard drives. Magnets alter the direction of a magnetic material on a hard disk in segments that then represent computer data. Later, computers read the direction of each segment of magnetic material to "read" the data. The small speakers found in computers, televisions and radios also use magnets; inside the speaker, a wire coil and magnet converts electronic signals into sound vibrations.
Ashleigh

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Magna Doodle is a magnetic drawing toy, consisting of a drawing board, a magnetic stylus, and a few magnet shapes. Invented in 1974, over forty million units have been sold to date worldwide, under several brands, product names and variations.[citation needed]

The key element of the toy is the magnetophoretic display panel, filled with a thick, opaque white liquid containing tiny dark magnetic particles. These particles can be drawn to the drawing surface by a magnet-tipped stylus or optionally-provided shapes, or removed to the hidden back side by a sliding eraser bar. The middle layer is divided into a honeycomb of cells, keeping the liquid static and the particles evenly distributed across the panel. The liquid is formulated so that the floating particles can be pulled through it in response to the magnetic forces, but not due to gravity.[1]

The toy was originally produced as "Magna Doodle" by Tyco until 1997, when Tyco was purchased by Mattel. Mattel then sold the toy under its Fisher-Price brand. The brand was later sold to the Ohio Art Company. Today, the "Magna Doodle" brand is owned by Cra-Z-Art. Fisher-Price have produced their own alternative called the Doodle Pro, while Ohio Art produced the similar Doodle Sketch until 2016 when it sold the brand to Spin Master. The Doodle Pro is still available in the UK from the distribution company Megatel LTD.

Because the Magna Doodle uses no ink or graphite, scuba instructors use it as an underwater whiteboard when instructing students, and divers who wish to pass short notes.[citation needed] The Magna Doodle is not specifically designed to work underwater and many of its components can rust or otherwise deteriorate over time.
Bryan lee (19

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Like poles attracts, unlike poles repell each other
Joi Ong (32)

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These are some noticeboard magnets. We use them to paste notices and messages on the noticeboard.

Quek Meng Kiat

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These are some noticeboard magnets. We can use them to paste notices and messages on the noticeboard.

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These are some noticeboard magnets. We can use them to put notices and messages on the noticeboard.

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magnetic bookmarks are better than any other bookmarks as it do not slide off from the page.
Elina yong (8)

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Elina Yong ( 8 )
you can play a magnetic gameboard with a magnetic token.

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A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, and attracts or repels other magnets.

A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to a magnetic field, by one of several other types of magnetism.

Bryan Lee (19)

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some book divider are magnetic only those divider who are made of metal Clarisa(40

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If you take a big magnet, you can the magnet have been attracted by the scisoss Clarisa(40

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If you take a magnet and a coin , the coin will be attracted to each other coin                  Clarisa(40

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we place a doorstopper to keep the door open so we do not need to keep opening the door Clarisa (40

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A samarium–cobalt (SmCo) magnet, a type of rare earth magnet, is a strong permanent magnet made of an alloy of samarium and cobalt. They were developed in the early 1960s based on work done by Karl Strnat and Alden Ray at Wright-Patterson Air Force Base and the University of Dayton, respectively. In particular, Strnat and Ray developed the first formulation of SmCo₅.[1][2] They are generally ranked similarly in strength to neodymium magnets,[3] but have higher temperature ratings and higher coercivity. They are brittle, and prone to cracking and chipping. Samarium–cobalt magnets have maximum energy products (BHmax) that range from 16 megagauss-oersteds (MG·Oe) to 33 MG·Oe, that is approx. 128 kJ/m³ to 264 kJ/m³; their theoretical limit is 34 MG·Oe, about 272 kJ/m³. They are available in two "series", namely Series 1:5 and Series 2:17.

Uses of samarium-cobalt magnet

1.  They are used for manufacturing high speed motors and Turbo- machinery. 2. Used in equipments that requires functioning at cryogenic temperatures. 3.Traveling-wave tubes are designed with the help of this essential element.4. Are used for manufacturing certain musical instruments.

Goh Ray Chard (12)

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magnetic alphabets stick on refrigerator door and it can make many kinds of word after making one word Clarisa( 40

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Many building toys have magnets in them. The magnets make the building blocks stick together. You’ll also see magnet couplers used to connect the cars in a toy train set. Magnetic chess and checkers sets keep the game organized with a little magnet in each game piece. By themselves, magnets make fascinating toys and clearly demonstrate magnetic principles.

kavan yeo(15

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Electric motorsAn electric motor from a DVD driveThis is a huge category.  If you can think of something electronic that moves, it probably has magnets in it (not 100%, though).  The automatic windows in cars?  Each window has its own motor.  The tray on your DVD player?  Motors.The popularity of magnetic tape recordings with VHS VCRs has declined, but our transition to DVDs and BluRay optical discs doesn’t mean we got rid of magnets.  The typical DVD player has quite a few of them inside, including a motor to spin the disc, a motor to open and close the disc tray, a motor to roughly position the read head/laser, and even a fine electromagnetic control of the read head.  That's at least four magnets right there in one DVD player!If your computer has a disc reader/writer in it, figure that has another 4+ magnets.What else in the home moves with electric motors?  The ice dispenser in a fridge.  The garbage disposal.  A trash compactor.  The spinning tray in a microwave (in addition to the big magnet used in making the microwaves).  Electric fans, the blower in a hair dryer, fans and blowers in a refrigerator.  A garage door opener.  The pump in an aquarium.  The rotating parts of washers and dryers.  Blenders and mixers.  The list goes on and on, and most of these motors have permanent magnets in them.Note: Not every electric motor has a permanent magnet in it.  Some kinds of motors, like the electric induction motor, uses two coils of wire instead of a coil and a permanent magnet.  The motor in my ShopVac is an induction motor, and does not use permanent magnets.In a car, all sorts of things are controlled by motors: power windows, various pumps, windshield wipers and more.

# data[].attributes.subject
Electric motorsAn electric motor from a DVD driveThis is a huge category.  If you can think of something electronic that moves, it probably has magnets in it (not 100%, though).  The automatic windows in cars?  Each window has its own motor.  The tray on your DVD player?  Motors.The popularity of magnetic tape recordings with VHS VCRs has declined, but our transition to DVDs and BluRay optical discs doesn’t mean we got rid of magnets.  The typical DVD player has quite a few of them inside, including a motor to spin the disc, a motor to open and close the disc tray, a motor to roughly position the read head/laser, and even a fine electromagnetic control of the read head.  That's at least four magnets right there in one DVD player!If your computer has a disc reader/writer in it, figure that has another 4+ magnets.What else in the home moves with electric motors?  The ice dispenser in a fridge.  The garbage disposal.  A trash compactor.  The spinning tray in a microwave (in addition to the big magnet used in making the microwaves).  Electric fans, the blower in a hair dryer, fans and blowers in a refrigerator.  A garage door opener.  The pump in an aquarium.  The rotating parts of washers and dryers.  Blenders and mixers.  The list goes on and on, and most of these motors have permanent magnets in them.Note: Not every electric motor has a permanent magnet in it.  Some kinds of motors, like the electric induction motor, uses two coils of wire instead of a coil and a permanent magnet.  The motor in my ShopVac is an induction motor, and does not use permanent magnets.In a car, all sorts of things are controlled by motors: power windows, various pumps, windshield wipers and more.

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kavan yeo[15]

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The stripe on the back of a credit card is a magnetic stripe, often called a magstripe. The magstripe is made up of tiny iron-based magnetic particles in a plastic-like film. Each particle is really a very tiny bar magnet about 20 millionths of an inch long.

Your card also has a magstripe on the back and a place for your all-important signature.

The magstripe can be "written" because the tiny bar magnets can be magnetized in either a north or south pole direction. The magstripe on the back of the card is very similar to a piece of cassette tape fastened to the back of a card.
kavan yeo[15]

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Neodymium magnet spheres constructed in the shape of a cube

Neodymium magnet spheres used to form different shapes

"Bucky Ball" toy neodymium magnet spheres in close-up

Neodymium magnets, usually small spheres, have been manufactured as educational toys, stress relief products, and an artistic medium.
kavan yeo[15]

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magnetic boards

1. 1. Sheets of ferromagnetic material with specially-painted light surfaces on which material can be written or drawn using suitable markers or pens.

2. 2. Two main forms of Magnetic Boards 1. Magnetic chalkboards -Surface made of ferromagnetic material covered with a thin layer of dark-coloured vitreous particles. 2. Magnetic marker boards

3. 3. Uses:  Both types of boards enable display items made of (or backed with) magnetic material to be stuck to and moved about on their surfaces;  Both enable this movable display to be supplemented by writing or drawing on the board;  Magnetic boards can be used to produce highly sophisticated displays that enable movement and change in systems to be clearly demonstrated to a class or small group.

4. 4. Samples of Magnetic Boards

5. 5. Making your own Magnetic Board Things you will use: 1. Galvanized metal (not the roofing material-can be found in the plumbing section); 2. Cardboard; 3. Glue; 4. Paint 5. Fabric/cloth; 6. frame

6. 6. Instruction: 1.Cut the galvanized metal according to the desired size; 2.Glue the metal piece to the cardboard;

7. 7. 1. When desired to cover it with a cloth or fabric, put the metal side of the cardboard down on the back of the fabric; 2. Glue the edges of the fabric to the back of the cardboard; 3. Prepare the frame and put the fabric covered cardboard inside, and finished.

8. 8. How to make a magnetic chalkboard well Instructions: 1. buy magnetic paint and chalkboard paint, in quarts or gallons depending on the magnetic chalkboard area you wish you create. Look for magnetic and chalkboard paints at a home store, paint store or online. 2. Mask off a section of wall or decide to paint an entire wall. Lay drop cloths or plastic around the area to protect it from paint spilling or dripping.

9. 9. 3. Paint 2 to 3 coats of magnetic paint on the desired wall or space, making sure to mix the paint thoroughly to avoid particles settling together. Allow paint to dry completely between coats and after you’ve finished the last coat. 4. Test magnetic strength by placing a few magnets of various sizes onto the painted surface. If the strength isn’t what you want, add another coat and repeat the test once the paint is dry. 5. Paint 1 to 2 coats of chalkboard paint, following the manufacturer’s specific instructions for best results. Allow paint to dry between coats and after you’ve finished painting the last coat.

10. 10. 6. Pull masking tape away from the wall and test the chalkboard. If you want, build a chalk tray from scrap wood or hang mesh bags to hold colored chalk and paper. 7. Adhere magnetic sheet strips to posters and photographs and add small magnets for a creative work or play space. Use alphabet and number magnets, colored chalk and photos for a movable collage and idea board.

11. 11.  To produce a magnetic chalkboard, the surface should be painted with a suitable dark- coloured matt paint, while to produce a magnetic marker board, a suitable light coloured silk or gloss paint should be used.  Two main ways of producing such materials: 1. make them out of special “magnetic rubber” which is available in sheet and strip form 2. make them out of a non-magnetic material such as stiff card and then to stick strips of magnetic rubber or small magnets to their backs, so that they will adhere to the board.

12. 12. NON-PROJECTED PICTURES or PICTURE DISPLAY

13. 13. Are those which require no projection material or any electric power. Are mostly composed of study prints, charts, posters, maps, flash cards, photographs, textbook illustrations, and illustrations found in magazines and newspapers. They are all much the same except that study prints are mounted and curriculum oriented.

14. 14. USES: Educators, scholars and students may use or display non-projected images in connection with lectures or presentations in their fields. Motivate the students Presents matter symbolically Presents abstract in visual form Creates problem and stimulates thinking

15. 15. RELEVANCE The direct relevance of an image to what is being read or heard is vital. Because sight is the most receptive sense for most people, an obscure or irrelevant image will distract from other messages being given. Further, to be useful and add to the learning context, an image used in teaching must relate to both the substance of the lecture and the needs of the students.

16. 16. The most valuable image will complement what is being said. For example, an image may be used to:  Explain a technical term (or simply to spell it),  Trigger the description of an example or short anecdote so that the lecturer may elaborate on a new idea.  Obtain a response from the students (multiple- choice questions may be used, or a problem posed by a projected image), or  Link one argument with a text.

17. 17. Clarity Visual clarity assists interpretation. It is essential to the image and the message it represents. There are a number of ways to promote visual clarity:  Carefully select the image with its background. A white (or clear) background for a black image is not the most successful for projection because the bright light is tiring on the eyes. Either a yellow background for a black image or a dark blue background for a white or yellow image is preferable.

18. 18.  Consider the shape, size and spacing of letters. A bold, simple and lower case lettering style is most legible.  Omit distracting detail and include selective emphasis. Attention to these elements of clarity will make visual information more accessible. The corollary of this is that when they are drawn clearly, the gradual revelation of details will facilitate an explanation and allow for a greater amount of visual information to be presented.

19. 19.  Simplicity of lay-out: It refers to the arrangement of the elements of the image.  Efficient use of colors: (i) Use bold illustrations, (ii) Avoid fancy lettering style, (iii) proper use of color  Neatness: The graph should be neat, clean and artistic. It should be of good quality.  Accuracy: the scales and the measurements of the graph should be accurate and intelligible to the students.  Drawing and paper: the image should be properly drawn. The paper should be good. The pencil that is used should be good.  Hints: The hints should be properly explained. The marks on the image should be such that the students may know them by themselves.

20. 20. Advantages of non-projected pictures  Do not need a power source and apparatus to make them seen either on the wall or screen.  They can be viewed straight as they are  They are flexible  They have visual appeal and are easy to move  They can be carefully stored and preserved for use in the future  They display specific information

21. 21. Advantages of non-projected pictures  They can be used at all levels of learning  Pictures can also maintain high level of interest in the lesson  Numerous  Readily accessible to the teacher  They have an educational value  Easy to carry

22. 22. Disadvantage of non projected pictures  It may become outdated  They cannot present motion materials effectively as a result, their ability to engage all of our senses for a total learning experience is quite limited.  Copies may wear out when overused. Picture quality may diminish overtime.  They are difficult to revise and update if produces in a hard bound format  Easy to damage  Not interactive

23. 23. Disadvantage of non-projected pictures:  Not visible to all students in the class  Misinterpretation  Takes up the time of the teacher if she has to prepare the materials  Images lose their charm, if it contains too much matter on it  Poor use of color combination, improper spacing and margins creates confusion in the minds of the students  If used for a prolonged period it becomes boring for the students  If the picture is not drawn neatly, it looses its purpose

24. 24. What are the impact to the learner or learning process?

25. 25.  Students learn in a variety of different ways, some students need visual aids, some need to creatively stimulated, others need to be constantly entertained in order to keep them from falling asleep or disrupting the class  Visuals or just one way out of many to meet the needs of all students.  Design developmentally appropriate learning opportunities that apply technology-enhanced instructional strategies to support the diverse needs of learners.

26. 26.  Reasoning can be developed through the use of images. Students might be asked to explain the sequence, patterns or logic in a series of images that relate to a particular process.  Skills of analysis and synthesis can be taught and developed using images. Students can be involved in the dissection information or assembling a series of seemingly unrelated images into meaningful information.

27. 27.  Cause-and-effect relationship can be seen more clearly when the information is presented visually.  Identification of sequence in process or procedures and the recognition of errors can be taught with the assistance of well- drawn images.  Students can be asked to make judgements based on a series of given criteria when part of the information is presented visually.

28. 28. How to prepare the materials?  Decide the theme.  Decide the most suitable words to provide a title or slogan.  Sketch some layouts and decide on the best.  Gather all needed material to prepare the picture.  Prepare the lettering.  Add desired objects.  Give the finishing touches and erase the smudge marks

kavan yeo[15]

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refrigerator magnets

Manufacture[edit]

retail display of magnets

The first fridge magnets were cylindrical or solid rectangular magnets. Later, a flexible magnet was developed, composed of a high-coercivity ferromagnetic compound (usually ferric oxide) mixed with a plastic binder.[4] This is extruded as a sheet and passes on a conveyor belt over a line of powerful cylindrical permanent magnets. These magnets are arranged in a stack with alternating magnetic poles facing up (N, S, N, S,...) on a freely rotating shaft. This impresses the plastic sheet with the magnetic poles in an alternating line format. No electromagnetism is used to generate the magnets. The pole-pole distance is on the order of 5 mm, but varies with manufacturer. Ferritemagnets are commonly used, too, with decorative elements attached to the magnets with adhesive. They were created in the 1920s.[5]

Magnetic polarization[edit]

Halbach array polarisation

Magnetic viewing film showing magnetic poles of a fridge magnet

Unlike most conventional magnets that have distinct north and south poles, flat refrigerator magnets are magnetized during manufacture with alternating north and south poles on the refrigerator side.[6] This can be felt by taking two similar (or identical) refrigerator magnets and sliding them against each other with the "magnetic" sides facing each other: the magnets will alternately repel and attract as they are moved a few millimeters. One can note that magnetic field outside a uniformly magnetized thin sheet is actually zero, neglecting the edge effects (see, for instance, D. Budker and A. Sushkov, Physics in Your Feet", OUP, 2015), so a uniformly magnetized magnet does not stick to a refrigerator. Most magnets have a special, slightly more sophisticated magnetization pattern called a Halbach array. This construction gives enhanced magnetic field on one side and almost zero magnetic field on the other.

Alphabetical refrigerator magnets

Magnetic poetry about a domestic cat

Collecting[edit]

Collecting magnets is a hobby, with some collectors specializing in magnets from their travels, or of a particular theme.[7] They are sold at souvenir shops worldwide. There is no generally recognized term (e.g. numismatics for currency collecting) for magnet collecting. A Russian collector has proposed the term memomagnetics (Russian: мемомагнетика), derived from the words memoriale (Latin) and magnetis (Greek)[8] A collector of magnets would be called memomagnetist. These terms have been used by at least one Russian online community for magnet collectors.[9]

According to Collector's Lot magazine, in March 1999, Tony Lloyd of Cardiff, Wales, coined the term "thuramgist" for a "collector of fridge magnets".

Large collections[edit]

Fridge Magnets on a board - Private Collection

At one time, the largest verified collection of refrigerator magnets belonged to Louise J. Greenfarb from Henderson, Nevada (suburb of Las Vegas, United States). Her world record was included to the Guinness World Records with 19,300 items as of 1997.[10] According to the British "Book of alternative records", it grew to 29,000 as of February 2002, and later up to over 30,000 items.[11] Over 7,000 magnets from Greenfarb's collection were exhibited at the Guinness Museum in Las Vegas, which has since closed. According to her son, Bryan Greenfarb, as of November 2015 Louise still collects and has around 45,000 plus non-duplicate refrigerator magnets but the Guinness verification process, which can take over 6 plus months, is just too taxing to keep validating the exact number.

In January 1999, Tony Lloyd, a teacher in Cardiff, Wales, was interviewed by the Channel 4 Television programme Collector's Lot when it was ascertained that he had largest collection of fridge magnets in Europe at that time, over 2000.[12] As of January 2016 he had a collection of over 4500. He was again interviewed by the BBC and ITV during 2017. In February 2018, whilst on holiday in Sri Lanka, his 104th country, Tony's collection surpassed 5,000 magnets.
kavan yeo [15]

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Computers and electronics

Many computers use magnets to store data on hard drives. Magnets alter the direction of a magnetic material on a hard disk in segments that then represent computer data. later, computers read the direction of each segment of magnetic material to" read " the data. the small speakers found in computers , televisions and radios also use magnets; inside the speaker , a wire coil and magnet converts electronic signals into sound vibration.
By Isabelle Han (13)
3 Sincerity

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An electromagnetic cranes job is to get metals from one place to another . This diagram is to show exactly how this works and what it does . Our crane does this same thing, but instead of large metals , we move small things such as screws . The electromagnet on the crane picks the metals up using magnetism . It then brings it over and cutting/clicking off the magnetism, it releases the metal from the magnets "grip".
Kavan Yeo (15)

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Magna Doodle is a magnetic drawing toy, consisting of a drawing board, a magnetic stylus, and a few magnet shapes. Invented in 1974, over forty million units have been sold to date worldwide, under several brands, product names and variations.[citation needed]

The key element of the toy is the magnetophoretic display panel, filled with a thick, opaque white liquid containing tiny dark magnetic particles. These particles can be drawn to the drawing surface by a magnet-tipped stylus or optionally-provided shapes, or removed to the hidden back side by a sliding eraser bar. The middle layer is divided into a honeycomb of cells, keeping the liquid static and the particles evenly distributed across the panel. The liquid is formulated so that the floating particles can be pulled through it in response to the magnetic forces, but not due to gravity.[1]

The toy was originally produced as "Magna Doodle" by Tyco until 1997, when Tyco was purchased by Mattel. Mattel then sold the toy under its Fisher-Price brand. The brand was later sold to the Ohio Art Company. Today, the "Magna Doodle" brand is owned by Cra-Z-Art. Fisher-Price have produced their own alternative called the Doodle Pro, while Ohio Art produced the similar Doodle Sketch until 2016 when it sold the brand to Spin Master. The Doodle Pro is still available in the UK from the distribution company Megatel LTD.

Because the Magna Doodle uses no ink or graphite, scuba instructors use it as an underwater whiteboard when instructing students, and divers who wish to pass short notes.[citation needed] The Magna Doodle is not specifically designed to work underwater and many of its components can rust or otherwise deteriorate over time.

In popular culture[edit]

In the TV comedy Friends, a Magna Doodle is visible in Joey and Chandler's apartment, with various messages written on it throughout the series, referencing plot points, current events, inside crew jokes, or just random drawings.[2]

A version of the Magna Doodle was used in the 1990s Game Show Nick Arcade during their "Video Challenge" games.

kavan yeo[15]

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Magnets used in daily life (Flash drive)

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Magnets used in daily life (Flash drive)

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A hard drive has a very powerful magnet inside that controls the read-write head movement. If the magnet inside the drive itself doesn’t delete information, any magnet that isn’t insanely powerful won’t wipe it either.

While a magnet isn’t going to wipe your hard drive, if you leave a powerful magnet directly on top of your hard drive there is a slight chance that it could cause damage to the hard drive itself while it’s functioning. The easy solution: don’t put a magnet directly on top of your hard drive during use. By doing that, you can be confident that your hard drive, and the information stored on it, is completely safe.
Germaine Ng (30)

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Computers and Electronics

Many computers use magnets to store data on hard drives. Magnets alter the direction of a magnetic material on a hard disk in segments that then represent computer data. Later, computers read the direction of each segment of magnetic material to "read" the data. The small speakers found in computers, televisions and radios also use magnets; inside the speaker, a wire coil and magnet converts electronic signals into sound vibrations.

Electric Power and Other Industries

Magnets offer many benefits to the industrial world. Magnets in electric generators turn mechanical energy into electricity, while some motors use magnets to convert electricity back into mechanical work. In recycling, electrically-powered magnets in cranes grab and move large pieces of metal, some weighing thousands of pounds. Mines use magnetic sorting machines to separate useful metallic ores from crushed rock. In food processing, magnets remove small metal bits from grains and other food. Farmers use magnets to catch pieces of metal that cows eat out in the field. The cow swallows the magnet with its food; as it moves through the animal’s digestive system it traps metal fragments.

Health and Medicine

Magnets are found in some commonly used medical equipment such as and Magnetic Resonance Imaging machines. MRIs use powerful magnetic fields to generate a radar-like radio signal from inside the body, using the signal to create a clear, detailed picture of bones, organs and other tissue. An MRI magnet is very strong – thousands of times more powerful than common kitchen magnets. Another medical use for magnets is for treating cancer. A doctor injects a magnetically-sensitive fluid into the cancer area and uses a powerful magnet to generate heat in the body. The heat kills the cancer cells without harming healthy organs.

In the Home

Though it may not be obvious, most homes contain many magnets. Refrigerator magnets hold papers, bottle openers and other small items to the metal refrigerator door. A pocket compass uses a magnetic needle to show which way is north. The dark magnetic strip on the backside of a credit card stores data in much the same way as a computer’s hard drive does. Vacuum cleaners, blenders and washing machines all have electric motors that work by magnetic principles. You’ll find magnets in phones, door bells, shower curtain weights and children's toys.
kavan yeo[15]

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CRT monitors (those big tube monitors everyone used to use) use magnets to help project the image on the screen, so an external magnet would definitely cause some problems if the monitor wasn’t shielded
Germaine(30).

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Small magnet hold the tin lid, whilst the can revolves during the can opening operation.

Geak boon(11)

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People use magnetic knife rack to stick their knives onto the wall.
Geak boon(11)

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Health and Medicine

Magnets are found in some commonly used medical equipment such as and Magnetic Resonance Imaging machines. MRIs use powerful magnetic fields to generate a radar-like radio signal from inside the body, using the signal to create a clear, detailed picture of bones, organs and other tissue. An MRI magnet is very strong – thousands of times more powerful than common kitchen magnets. Another medical use for magnets is for treating cancer. A doctor injects a magnetically-sensitive fluid into the cancer area and uses a powerful magnet to generate heat in the body. The heat kills the cancer cells without harming healthy organs.
Kavan Yeo(15)

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Magnets help switch on or off the computers.
Germaine Ng (30)

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Magnets are used to sort out the magnetic and non magnetic substances from the scrap.

Geak Boon(11)

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Magnets are used in the electrical bells.

Geak boon(11)

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Magnets are used in the speakers which can convert the electrical energy into sound energy.

Inside a speaker, an electromagnet is placed in front of a permanent magnet. The permanent magnet is fixed firmly into position whereas the electromagnet is mobile. As pulses of electricity pass through the coil of the electromagnet, the direction of its magnetic field is rapidly changed. This means that it is in turn attracted to and repelled from the permanent magnet, vibrating back and forth.

The electromagnet is attached to a cone made of a flexible material such as paper or plastic which amplifies these vibrations, pumping sound waves into the surrounding air and towards your ears.

Geak boon (11)

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Magnets can be used in construction sites to carry heavy objects .
Germaine Ng(30

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Magnets are used to construct the electrical motors and the generators which convert the electrical energy into mechanical energy and vice verse.

Geak Boon(11)

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we have magnetic door stopper at home.

Geak Boon(11)

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Coins are separated and sorted inside vending machines with magnets. These magnets sort out metal disks or slugs from the real coin money. Also, paper money and checks have magnetic dust in their ink. Vending machines and currency counters check the money for its magnetism to insure the money is genuine.

Geak Boon(11)

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Magnetically levitated trains, known as mag-lev trains, use magnets under the cars to float above the magnetic tracks because the magnets are repelling each other. These types of trains use superconducting magnets and can travel up to 300 miles per hour. Mag-lev trains are used in countries such as Japan.

Geak Boon(11)

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Magnets can be used in class when the teacher is putting up notifications on the whiteboard and electronic fans use magnet  to operate too . Geak Boon(11)

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The magnetic compass is the most familiar compass type. It functions as a pointer to "magnetic north", the local magnetic meridian, because the magnetized needle at its heart aligns itself with the horizontal component of the Earth's magnetic field. The magnetic field exerts a torque on the needle, pulling the North end or pole of the needle approximately toward the Earth's North magnetic pole, and pulling the other toward the Earth's South magnetic pole.[8] The needle is mounted on a low-friction pivot point, in better compasses a jewel bearing, so it can turn easily. When the compass is held level, the needle turns until, after a few seconds to allow oscillations to die out, it settles into its equilibrium orientation.

In navigation, directions on maps are usually expressed with reference to geographical or true north, the direction toward the Geographical North Pole, the rotation axis of the Earth. Depending on where the compass is located on the surface of the Earth the angle between true north and magnetic north, called magnetic declination can vary widely with geographic location. The local magnetic declination is given on most maps, to allow the map to be oriented with a compass parallel to true north. The location of the Earth's magnetic poles slowly change with time, which is referred to as geomagnetic secular variation. The effect of this means a map with the latest declination information should be used.[9] Some magnetic compasses include means to manually compensate for the magnetic declination, so that the compass shows true directions.

Kavan Yeo[15]

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Refrigerator magnets hold papers, bottle openers and other small items to the metal refrigerator door. A pocket compass uses a magnetic needle to show which way is north. The dark magnetic strip on the backside of a credit card stores data in much the same way as a computer’s hard drive does. Vacuum cleaners, blenders and washing machines all have electric motors that work by magnetic principles. There are magnets in phones, door bells, shower curtain weights and children's toys.

Geak boon(11)