A bar magnet has a coercivity 4 × 103 Am–1. It is desired to demagnetize it by inserting it inside a solenoid 12 cm long and having 60 turns. The current that should be sent through the solenoid is

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answer is 4.

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Detailed Solution

B=μ0H=μ0Nil ; i=HlN=4 x 103 x 1260 x 100=8 A

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