Page:Elementary lectures on electric discharges, waves and impulses, and other transients (Steinmetz 1911).djvu/26

 are crowded together between the conductors, and the magnetic field consists of eccentric circles surrounding the conductors, as shown by the drawn lines in Fig. 9.

The magnetic field represents stored energy $$w$$. To produce it, power, p, must therefore be supplied by the circuit. Since power is current times voltage, $$