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Q.

The coercive force for certain permanent magnet is 2 x 104 A / m. This magnet is placed inside a long solenoid of 40  turns/cm and a current is passed in the solenoid to demagnetize the magnet. The value of current (in A) is

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answer is 5.

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Detailed Solution

H=B/μ0 ni=2×10440×100i=2×104 i=204A=5A

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