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Q.

A flat coil carrying a current has a magnetic moment µ. It is initially in equilibrium, with its plane perpendicular to a magnetic field of magnitude B. If it is now rotated through an angle θ, the work done is

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a

μB(1−cos⁡θ)

b

μBcos⁡θ

c

μBθ

d

μBsin⁡θ

answer is C.

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Detailed Solution

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Initial potential energy= -μB

Final potential energy=-μBcosθ

Work done = -∆U

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