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Q.

A magnetic dipole of moment m is in a uniform magnetic field of induction B. If it is in stable equilibrium position in the field, the torque acting on it and potential energy are respectivley

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a

$z e r o, - m B$

b

$m B, z e r o$

c

$- m B, z e r o$

answer is D.

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Detailed Solution

Torque is $\bar{m} \times \bar{B}$ and potential energy is
U = $- \bar{m} \cdot \bar{B}$ . For stable equilibrium, $θ = 0^{0}$

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