Question

A bar magnet has a coercivity of . It is placed inside a solenoid of length having 60 turns in order to demagnetize it, the amount of current that should be passed through the solenoid is:

A

B


C

D

Medium
Updated on : 2022-09-05
Solution
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Correct option is B)

Given:

           

           

Bar magnet requires a magnetic intensity () to become demagnetized.

Let be the number of turns per unit length.

 Now,

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