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Module 1: Magnets and magnetism

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Magnets and magnetic fields

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XSIQ
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Physics - Magnets and magnetic fields

Magnets and magnetic fields

The magnetic fields produced by common permanent magnets are shown below.
You should be familiar with the common properties of magnets such as:

* only certain metals are affected by magnets, or are capable of being
magnetised

* all permanent magnets have a north pole and a south pole

* it is impossible to create just one pole, the domains inside a magnet
cannot be broken into a north and south pole

* magnetising a ferromagnetic material involves aligning the previously
randomly-arranged magnetic domains

* heating or beating a permanent magnet will reduce its magnetism as the
domains become more randomly aligned

* opposite poles attract each other

* two like poles will repel each other

* when a magnet picks up an item such as a paper clip, that paper clip
temporarily becomes a magnet itself. That is, magnets can induce magnetic
alignment in nearby susceptible materials.

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