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MAGNETS download (1) (APPLICATIONS OF MAGNETS (1.hold objects in place,…

- - - - Lodestone
    - - 2.Iron
        
        made into temporary magnets
        (lose magnetic properties after
        a short time)
      - 3.Steel
        
        made into permanent magnets
        (retain magnetic properties
        for a long time)
      - 1.Special
        alloys
      - 4.Special mixtures
- - - - Iron
      - Steel
      - Nickle
      - Cobalt
    - - Metals
        
        Gold
        
        Silver
        
        Aluminium
        
        Copper
      - Non-metals
        
        Glass
        
        Wood
        
        Rubber
        
        Plastic
        
        Clay
- - - - iron nails
      - thumbtacks
      - paper clips
      - staples
    - - The more items a magnet
        can attract, the stronger it is
      - The further an item can
        be attracted, the stronger the magnet
- - - - how?
        
        Stroke iron rod with one pole of magnet
        
        Repeat the stroking process a few times using the same pole and in the same direction
        
        Bring iron rod near steel clips to test magnetism
        
        the position where the stroking magnet leaves the iron rod will have an opposite pole to the stroking magnet
      - make stronger?
        
        the more the number of strokes,
        the stronger the magnet
    - - how?
        
        Coil the electrical wire as many times as
        possible around the nail
        
        Connect the ends of the wires to the ends of
        batteries
        
        Once circuit is switched on, iron nail will be magnetised.
        
        This kind of magnet is called an electromagnet
        
        It is a temporary magnet. once the circuit is switched off
        the iron nail loses its magnetism
      - make stronger?
        
        the more the number of turns of wires,
        the stronger the magnet
        
        the more the number of batteries,
        the stronger the magnet