Ch – 13 Fun With Magnets

  • Greek shepherd Magnes first discovered about magnets when his stick was attracted to a rock.
  • Those natural magnet rocks were named as magnetite.
  • Magnetite contains iron.
  • Some people believe that magnetite was first discovered at a place called Magnesia.
  • The substances having the property of attracting iron are now known as magnets.
  • The magnets discovered in nature are called natural magnets.
  • The magnets which are made artificially by men are called artificial magnets. Eg: Bar magnet, Horse-shoe magnet, Cylindrical magnet.
  • The materials which get attracted towards a magnet are magnetic materials. Eg: Nickle, Cobalt.
  • The materials which are not attracted towards a magnet are non-magnetic materials. Eg: Wood, Cotton.
  • The ends of the magnet are called poles of the magnet.
  • All magnets have two poles irrespective of their shape.
  • The magnetic strength is high on the poles.
  • A freely suspended bar magnet always comes to rest in North- South direction.
  • The end of the magnet that points towards North is called its North seeking end or the North pole of the magnet.
  • The other end that points towards the South is called South seeking end or the South pole of the magnet.
  • Like poles repel each other while unlike poles attract each other.
  • A compass is usually a small box with a glass cover on it. A magnetised needle is pivoted inside the box, which can rotate freely.
  • A compass also has dial with directions marked on it. Often North-South direction is highlighted with different colour.
  • Magnets lose their properties if they are heated, hammered or dropped from some height.
  • To keep them safe, magnets should be kept in pairs with their unlike poles on same side and separated by a piece of wood while two soft pieces of soft iron are placed across their ends.
  • Keep magnets away from cassettes, mobiles, television, music system, compact disks (CDs) and the computer

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

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