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Electro magnet
it is used in motors
Explanation:
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A) Bar magnet.
B)take a large nail and wrap thin insulated copper wire around the nail. The wrapped copper wire looks like a coil.Connet a battery between two free ends of the copper wire by removing some part of the insulated coating. Use plastic tapes to tightly connect wires to the battery
C)Magnets are used to make a tight seal on the doors to refrigerators and freezers.
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