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A spring made...

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.

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