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We show that the magnetic dipole energy term appearing in the expansion ofthe magnetic potential energy of a localized current distribution has the form$ U= + \bf{m} \cdot \bf{B}$ which is wrong by a sign from the well known $ -\bf{m} \cdot \bf{B}$ expression. Implication of this result in relation to theelectric dipole energy $ - \bf{p} \cdot \bf{E}$, and the force and torque onthe magnetic dipole based on this energy expression is also discussed.

On the magnetic dipole energy expression of an arbitrary current distribution