Many electrical devices that are characterised by voltage and current variables at more than two terminals are in common use in electrical engineering. Transformers in power engineering, transistors in electronics engineering, etc., are some examples.

1.8.1 Mutual Inductance Element

In our discussion on inductance earlier, we noted that there is an induced electric field at every point in space around a circuit due to time-varying currents in that circuit as well as in other neighbouring circuits. The work that will be done by this induced electric field when a unit positive test charge is taken over a path is called the induced e.m.f. in that path. Thus, there can be an induced e.m.f. in any element due to ...

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