Magnets
- 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.
- The 3 metals are the only pure metals that can be turned into a permanent magnet
- 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.
- You can’t test what a magnet is attracted to, but you can test what it repels.
- Magnetic field lines
- Untitled
- Bar magnets are permanent magnets. This means they're always magnetic
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