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The torque on a current loop of magnetic moment \( \mathbf{m} \) in a uniform field is

  • A.\( \mathbf{m} \times \mathbf{B} \)
  • B.\( \mathbf{m} \cdot \mathbf{B} \)
  • C.\( \mathbf{m}\mathbf{B}^2 \)
  • D.zero

Answer: A

The magnitude is the moment times the field times the sine of the angle between them, so the torque is greatest when the loop plane contains the field and zero when the moment is aligned with it. That aligned position is the one of stable equilibrium.

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