Rate of change of torque τ with deflection θ is maximum for a magnet suspended freely in a uniform magnetic field of induction B, when

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θ=0°

θ=45°

θ=60°

θ=90°

answer is A.

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Detailed Solution

τ=MBHsin⁡θ or dτdθ=MBHcos⁡θThis will be maximum. when θ=0o.

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