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=0o

b

θ=45o

c

θ=60o

d

θ=90o

answer is A.

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Detailed Solution

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