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One of the ways in which a coin operated vending machine checks to make sure that the coins fed to it are genuine is to roll them past a strong magnet. Only coins made of magnetic materials such as iron will be affected by the magnet. Coins made of a good conductor will speed up as they roll past the magnet. Coins made of a good conductor will slow down as they roll past the magnet. The coins will become magnetized and thus can easily be sorted.
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