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MAGNETISM PowerPoint Presentation

MAGNETISM

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MAGNETISM

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  1. MAGNETISM

  2. History Of Magnetism During 600BC an ore was discovered which had the property of attracting small pieces of iron. This ore was a black oxide of iron called magnetite.

  3. 1 Attractiveproperty-A magnet can attract certain material like iron nickel cobalt etc. These attractive properties are concentrated at the ends of a magnet called poles PROPERTIES OF A MAGNET

  4. 2 Directive property(lodestone) • 2 When a magnet is freely suspended it always orient along north south direction .

  5. 3 Poles exist in pairs • If a long magnet is broken into two pieces, each piece is found to be an individual magnet having its own pair of opposite poles at its two ends .

  6. Like pole repel and unlike poles attract each another. 4 The law of magnetism

  7. Materials Magnetic Non magnetic (Iron,nickel,cobalt ) (copper,brass,aluminium) Classification of materials

  8. Artificial magnet(methods of magnetisation) 1. Singletouchmethod 2. Dividedtouchmethod

  9. 3.By electric current

  10. SUMMARY 1 The substance which has the property to attract small pieces of iron and of setting along a definite direction when suspended freely ,is known as magnet. 2When a magnet is suspended freely, it always sets in north south direction. 3The point on magnet where the attraction appears to be maximum are called poles. 4Like poles repel each other while unlike poles attract each other. 5Poles exist in pairs. 6Magnetisation can be done either by single touch ,double touch or by electrical method 7Materials are classified in to two, magnetic and non-magnetic.