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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

A bar magnet has coercivity . It is desired to demagnetise it by inserting it inside a solenoid 12 cm long and having 60 turns. The current that should be sent through the solenoid is

Answer: (D)

Solution

The reverse field needed is with , so $I =

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Question ID VK-080567