Vector Potential, Aharonov-Bohm Eect and Electrodynamics of Tokamac

This paper proves that a vector potential in Electrodynamics is both an auxiliary function and a non-force magnetic eld. In this connection in the AharonovBohm eect, a quantum particle interacts with a non-force magnetic eld. The Stokes theorem remains valid and applicable to explanation of the AharonovBohm eect and to the electrodynamics of tokamac. Electrodynamics in a tokamac can be explained in terms of power and magnetic force elds.