  The interaction of a magnetic dipole with a point charge leads to an apparent
paradox when analyzed using the 3-vector formulation of the Lorentz force.
Specifically, the dipole is subject to a torque in some frames and not in
others. We show that when analyzed according to the covariant 4-vector
formulation the paradox disappears. The torque that arises in certain frames is
connected to the time-space components of the torque in the rest frame, giving
rise to "hidden" momentum.
