(b) Why do pins cling to the end of the nail when the key is closed as given in the figure?
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Some pins cling to the nail as the end of the magnet is brought close to the head of the tail. This happens because the nail turns into a magnet and acquires the properties of magnetism. The moment the magnet is removed from the head of the nail the pins fall down and the nail loses its properties of magnetism.
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