All magnets, whatever their shape have two poles, north and south. These are created when the magnet is made. Magnetic materials have a number of ’miniature magnets’ called domains, each themselves having a north and south pole. In a non-magnetized piece of metal, these domains are all jumbled up and their magnetic effects are cancelled out by each other. If the domains are all aligned, the overall effect becomes quite powerful and magnetism is produced.

Like poles repel, unlike poles attract
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