Magnetism Week 15 - Magnetism (Year 8) Usama Farooq Week 15...

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Magnetism (Year 8) Usama Farooq Week 15
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Magnetism (Year 8) What is a magnet? A magnet is something that has a magnetic field around it. Permanent magnets are usually made of steel, as steel keeps its magnetism. All magnets have two poles – a north pole and a south pole. The shape of the field around a bar magnet is like this : We say the field lines flow from north to south. The closer together the field lines, the stronger the magnetic field. The field is concentrated at the poles.
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Magnetism (Year 8) Testing for Magnetism The only test for magnetism is repulsion. If a piece of metal is attracted by a magnetic, that only proves that the metal is made of a magnetic material. To prove that it is a  magnet, it must REPEL another magnet. When two magnets are brought close to each other, there is a force between them.  N S N S N S S N S N N S S N S N attract attract repel repel
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Magnetism (Year 8) Magnetic Materials Most materials are not magnetic. A common mistake is to believe that metals are magnetic – only a very few are. The magnetic materials you need to know are : • iron • steel (which is nearly all iron) • nickel • cobalt
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Magnetism (Year 8) The Earth as a Magnet The Earth acts as a huge magnet. Compasses work because they are affected by the 
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This note was uploaded on 01/17/2012 for the course MASS COMMU 107 taught by Professor Masror during the Spring '11 term at College of E&ME, NUST.

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Magnetism Week 15 - Magnetism (Year 8) Usama Farooq Week 15...

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