• Created by: emews
  • Created on: 15-11-17 16:13
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  • Magnets
    • Bar magnets are permanent magnets. This means they're always magnetic
      • North pole
      • South pole
      • Opposite poles attract
      • Demagnetisation is when a magnet loses the strength of it's magnetic field due to being repeatedly knocked.
      • Magnets are made from magnetic materials - iron, nickel and cobalt.
        • The 3 metals are the only pure metals that can be turned into a permanent magnet
          • Steel is an alloy of iron and so can also be made into a magnet.
          • If these metals have not been turned into a permanent magnet they will still be attracted to a magnet if placed within a magnetic field.
        • Substances that can be permanently magnetised are described as magnetically hard.
        • Substances that can only be temporarily magnetised are described as magnetically soft.
    • Testing magnets
      • You can’t test what a magnet is attracted to, but you can test what it repels.
        • You can only show that an object is a magnet if it repels another magnet.
    • Magnetic field lines
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