13. FUN WITH MAGNETS

Chapter-Reviews: 

• The substances having the property of attracting iron are now known
  as magnets.
• Magnetite is a natural magnet.
• Magnetite contains Iron. 
• Magnets, which are made from a pieces of Iron by men are known as artificial magnets. 
• Nowadays artificial magnets are prepared in different shapes. For example, bar magnet, horse-shoe magnet, cylindrical or a ballended
  magnet.
• Artificial magnet is powerful magnet than natural magnet. 
• The materials which get attracted towards a magnet are magnetic – for example, iron, nickel or cobalt.
• The materials which are not attracted towards a magnet are non-magnetic. Examples: Plastics, wood, Alumunium, leather and papers etc. 
• Magnets have two poles, that are North pole and South pole. 
• When a bar magnet hanged freely with a thread by its balanced centre point after coming in rest its one of the pole lives toward north direction while other pole lives in 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.
• All magnets have two poles whatever their shape may be.
  Usually, north (N) and south (S) poles are marked on the magnets.
• Magnet is used to separate iron contains from the mixture of sand and iron fills.
• The most of the iron filings are attracted towards the two ends of a bar magnet.
• Magnets were known to people from ancient times.
• Magnets are also used to find  the direction, such device which is used to find the direction is known as compass. 
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