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Comparing the electric and magnetic dipoles in a uniform field, both experience

  • A.a net force toward the region of stronger field
  • B.no torque, only a couple about their own axes
  • C.a force proportional to the square of the field
  • D.a torque tending to align them with the field

Answer: D

The two cases are exactly parallel: a torque given by the cross product of the moment with the field, zero net force in a uniform field, and a net force toward stronger field only where the field varies. The analogy runs through the whole of dipole theory.

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