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Transcript of Magnetic forces
To know the idea of magnetic forces
To chart and plot a magnetic and repulsive field
Bar magnets have two poles:
north pole – normally shown as N
south pole – normally shown as S
Opposite (unlike) poles attract, and like poles repel.
If permanent magnets are repeatedly knocked, the strength of their magnetic field is reduced. Converting a magnet to a non-magnet is called demagnetisation.
Magnets are made from magnetic metals – iron, nickel and cobalt. These 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.
Bar magnets are permanent magnets. This means that their magnetism is there all the time and cannot be turned on or off as it can with electromagnets.
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