how to demagnetize a iron nail? How did this affect the domains in the nail?
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To demagnetize a nail magnetized by prolonged contact or rubbing, banging the nail on a hard surface or dropping it to the floor shakes up the aligned atoms with sharp impact. For the electromagnet, simply detaching one end of the copper wire from its terminal kills the magnetic field
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to de magnetise it you have to put it in the water
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