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A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A.

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A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The coercivity of the bar magnet is:

(1)  1200 A/m

(2)  2600 A/m

(3)  520 A/m

(4)  285 A/m 

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Correct option  (2) 2600 A/m

Explanation:

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