Page:A Treatise on Electricity and Magnetism - Volume 2.djvu/270

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238
GENERAL EQUATIONS.
[619.

The equations (D) of magnetization, of which the first is


become


The equations (E) of electric currents, of which the first is


become


The equation of the current of conduction is, by Ohm's Law,



That of electric displacement is



The equation of the total current, arising from the variation of the electric displacement as well as from conduction, is



When the magnetization arises from magnetic induction,



We have also, to determine the electric volume-density,



To determine the magnetic volume-density,



When the magnetic force can be derived from a potential