Question

please answers this Question​

Answer 1

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Sorry for the late answer….

Here is your answer…
Demagnetize a magnet by *heating or hammering*
You can get the same effect by repeatedly hammering a magnet, appliying pressure or dropping it on a hard surface. The physical disruption and vibration shake the order out of the material , demagnetize it.

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Answer 2

Answer:

As we know,magnetic pole strength is the measure of total flux density at the ends and it cut parallely its strength decreases and magnetic moment is product of pole strength and length thus as it is cut, pole strength decreases and thus moment.