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Question

A magnetic dipole in a constant magnetic field has ;

A
Minimum potential energy when the torque is maximum.
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B
Zero potential energy when the torque is minimum.
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C
Zero potential energy when the torque is maximum.
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D
Maximum potential energy when the torque is maximum.
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Solution

The correct option is D Zero potential energy when the torque is maximum.
U=μ.B=μBcosθ----------1
τ=μBsinθ--------------2
From 1 and 2, we can say that magnetic field has zero potential energy when the torque is maximum. Hence the answer and option C is correct

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