ABSTRACT
This chapter mainly deals with magnetic circuits and introduces inductance. In order to understand the essence of magnetic circuits, an analogy between electrical and magnetic field quantities is drawn. The limitations of this analogy are also noted. Based on this analogy, a configuration of magnetic circuit is obtained. Therein the involved exciting sources are identified, reluctances are calculated, equivalent circuit is formed, and the fluxes therein are evaluated. This chapter also describes the defining principle of inductance, includes mathematical relations, and spells the type of inductance. Inductances of some common configurations viz. coaxial cable, solenoid, and toroid are obtained. The expression for the energy stored in magnetostatic field is obtained by using the lumped circuit approach and the magnetic charge approach.
