A bar magnet has coercivity 4xx10^(3) Am...

A bar magnet has coercivity `4xx10^(3) Am^(-1)` it is desired to demagnetise it by inserting it inside a solenoid 12cm long and has 60 turns. the current that should be sent through the solenoid is

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MODERN PUBLICATION-MAGNETOSTATICS-MULTIPLE CHOICE QUESTION (LEVEL II)

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