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Q.

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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a

θ=0°

b

θ=45°

c

θ=60°

d

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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