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Question No The coercivity for a certain permanent magnet is 4 0 x 104 A...

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Question No The coercivity for a certain permanent magnet is 4 0 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 it completely Find the current 10 A 20 A 30 A 5 A

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