ABSTRACT

This chapter presents fundamental theoretical foundations for electromagnetic induction, most importantly Faraday’s law; and important consequences of electromagnetic induction, such as Lentz’s law and the skin effect. It examines some simple and commonly encountered examples, such as calculation of the inductance of a solenoid and coaxial cable; and a few common applications, such as generators, transformers, and electromagnets. The phenomenon of electromagnetic induction has a simple physical interpretation. Two charged particles at rest act on each other with a force given by Coulomb’s law. A time-varying current in one current loop induces an electromotive force (emf) in another loop. In linear media, an electromagnetic parameter that enables simple determination of this emf is the mutual inductance. The velocity of flowing liquids that have a small, but finite, conductivity can be measured using electromagnetic induction.