ELECTROMAGNETIC PROPERTIES OF A TOROIDAL SOLENOID

The electromagnetic properties of the toroidal solenoid with an alternating current are discussed. The multipole expansion for the electromagnetic field of the toroidal solenoid is obtained and explicit expressions for the toroidal form factors and moments are given. Concrete realization of the current flowing in the solenoid's winding is presented. It is shown that uniform rotation of the toroidal solenoid with a constant current in its winding leads to the appearance of a magnetic field outside the solenoid. For non-uniform rotation an electric field arises.