Introduction (EMI)

In this lesson we will see how the current and emf are induced in a circuit when the magnetic flux through the circuit changes with time.

In 1820, the connection between electricity and magnetism was demonstrated by Faraday and independently by Joseph Henry. They showed that an electric current could be induced in a circuit by a changing magnetic field.

The result of these experiments led to a very basic and important law of electromagnetism known as Faraday’s law of induction.

In this lesson we discuss the ideas of flux and the basic law of producing induced emf. Then we shall discuss inductor, which plays on important role in electrical circuits and its effect known as self induction and mutual induction. Finally, we examine the characteristics of circuits containing inductors, resistors and capacitors in various combinations.

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