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Question

A spring made from nickel is lifted up by a bar magnet . The magnet releases the spring when it is heated by passing current through it . Explain why ?

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Solution

Dear Student,

Nickel is a Ferromagnetic material , so it can be lifted by magnet however if ferromagnetic materials are heated then after reaching a certain temperature known as curie temperature they loose their ferromagnetism and hence will not get attaracted towards magnet above this temperature.This is the reason why on heating magnet releases nickel.

Regards

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