A circular current loop of magnetic moment \( M \) is in an arbitra...

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A circular current loop of magnetic moment \( M \) is in an arbitrary orientation in an external magnetic field \( B \). The work done to rotate the loop by \( 90^{\circ} \) about an axis perpendicular to its plane is
(a) \( M B \)
(b) \( \frac{\sqrt{3}}{2} M B \)
(c) \( \frac{M B}{2} \)
(d) zero
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