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2016-01-22T12:47:32+05:30

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Permanent magnet loses its magnetism because of 4 reasons 1-when it is heated above a point called curie temperature 2-via shock 3-near a demagnetising field 4-when they are subjected to heat It loses its magnetising power and become weak in a duration of time.
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2016-01-22T15:02:27+05:30
It is demagnetized when heated strongly, thrown from a height or hammered.
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