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JEE Main 2019 Physics question

PhysicsMoving Charges and MagnetismJEE Main 2019

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The coercivity of the bar magnet is:

Answer: (A)

Solution

H = ni = (100/0.2) × 5.2 = 2600 A/m.

Question ID VK-010043