The Electric Dipole Moment of a Moving Magnetic Dipole

The fact that a magnetic dipole $μ$ moving with velocity $βc$ has an electric dipole moment $p = β×μ/c$ has made periodic appearance in the literature but the importance of this fact and its general utility have not been given sufficient expression. It is the purpose of this paper to show how to derive the equation $p=β×/c$ and then to use it for a simple description of the atomic spin-orbit interaction.