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MHT CET Physics question

PhysicsMoving Charges and MagnetismMHT CET

A bar magnet having coercivity is demagnetised by inserting it inside a solenoid 10 cm long and having 50 turns. The current that should be sent through the solenoid is

Answer: (C)

Solution

To demagnetise, the reverse field must equal the coercivity: , with , so

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Question ID VK-080603