5.
What are the main types of magnets? Which one is more useful?
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Permanent magnets are commonly made from ceramic, alnico, and neodymium. Ceramic magnets are strong, and work well for most experiments. Alnico magnets are stronger and more expensive, and work very well for science experiments. Neodymium magnets are the strongest and most expensive of the three.
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The three types of magnets are temporary, permanent, and electromagnets. Magnets are categorized by their source of magnetism. Temporary magnets become magnetized in the presence of a magnetic field. They lose their magnetism gradually, when the magnetic field is removed.
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