Unipolar Induction

Unipolar Induction; Theory of the Uniform Motion of a System of Amperian Current Whirls.—The paper forms an inquiry as to the extent to which the so-called "Moving Line Theory" is the equivalent of the Maxwell-Lorentz theory. The latter gives the electric force on a fixed unit of charge in the form: $E=-\frac{\mathrm{I}\partial U}{c\partial t}-\mathrm{grad}\psi ,$ where $U$ is the Maxwellian vector-potential, and $\psi$ is the electrostatic potential.