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Torque on a current-carrying loop of magnetic moment \( \mathbf{m} \), placed in region of magnetic field \( \mathbf{B} \) is given by
(a) \( \tau=\frac{1}{2} \mathbf{m} \times \mathbf{B} \)
(b) \( =\mu_{0} \mathbf{m} \times \mathbf{B} \)
(c) \( \tau=\frac{\mu_{0}}{4 \pi}(\mathbf{m} \times \mathbf{B}) \)
(d) \( \tau=\mathbf{m} \times \mathbf{B} \)
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