classify magnets based on: a) how long the magnetism lasts,. b) how they are made of
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magnets are classifying in to 2
bar magnets & linear magnets
it's is made of ferromagnetic substance
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A permanent magnet, if kept and used in optimum working conditions, will keep its magnetism for years and years. For example, it is estimated that a neodymium magnet loses approximately 5% of its magnetism every 100 years.
Long ago, people dug up lodestone and used it as a natural magnet. If they needed to create other kinds of magnets, they'd just rub it on some of those other metals. ... The magnet can also be magnetized by being placed in a magnetizer, which has a powerful magnetic field.
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