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Physical Change

How to demagn...

Question

How to demagnetized a substance

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Solution

Hammer the substance

Heat the substance

Leave the substance for very long time

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Q. Identify the substance that is easy to magnetize and demagnetize?

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Q. (A) While magnetizing a substance we force all molecular magnets to align in a specific direction
(B) In demagnetization, we disturb the regular alignment and force molecular magnets to orient randomly.

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Q. The corecivity of a small magnet where the ferromagnet gets demagnetized is

3 \times 10^{3} A m^{- 1}

. The current required to be passed in a solenoid of length

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and number of turns

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, so that the magnet gets demagnetized when inside the solenoid is:

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