The coercive force for a certain permanent magnet is

Question:

The coercive force for a certain permanent magnet is $4.0 \times 10^{4} \mathrm{~A} \mathrm{~m}^{-1}$. This magnet is placed inside a long solenoid of 40 turns/cm and a current is passed in the solenoid to demagnetise it completely. Find the current.

Solution:

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