MHT CET Physics question

PhysicsMagnetism and MatterMHT CET

Not in JEE Advanced syllabus

A bar magnet, freely suspended in a magnetic induction H, makes 20 oscillation per minute ; When another magnet X is brought near it the number of oscillations are found to be 10 per minute. What is influencing induction of magnet X in terms of H? (where H > X)

Answer: (A)

Solution

with (as ), so gives

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Question ID VK-067904