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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=0o
b
θ=45o
c
θ=60o
d
θ=90o

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detailed solution

Correct option is A

τ=MBsinθ or dτdθ= MBcosθThis will be maximum when θ=0o

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