3.2 THE INDUCTOR
The physical basis for the two-terminal element, called inductor, has been dealt with in Chap. 1. We recapitulate briefly.
Moving charges, i.e., current flow, causes a magnetic field to be set up everywhere in space. When the current is time-varying, the magnetic field too will be time-varying. Time-varying magnetic field produces an extra electric force on charges everywhere – extra over whatever other forces that are present. This extra force – induced electric force – is non-conservative and results in an e.m.f. in the circuit. In the case of a closed loop, this e.m.f is related to the rate of change of magnetic flux by Faraday's law of induction.
This induced electric force will be present everywhere in the circuit when circuit ...
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