A bar magnet has coercivity 4 x 103 Am 1 It i desired to demagnetise it by inserting inside solenoid 12 cm long and having 60

Question

A bar magnet has coercivity 4 x 103 Am 1 It i desired to demagnetise it by inserting inside solenoid 12 cm long and having 60 turns The current that should be sent through solenoid is 1 2A 2 4A holls 3 6A 16 4 8A

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