Note on Electromagnetic Moment of Inertia

It is shown that the angular momentum of the stationary electromagnetic field surrounding a classical charged particle may be considered to be localized in the charge distribution. When the magnetic field is considered to be due to rotation of the charge, there exists a moment of inertia tensor relating the angular momentum of the field and the energy of the magnetic field to the angular velocity, just as the angular momentum, kinetic energy of rotation, and angular velocity are related in ordinary mechanics.