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U25CP1004
Faraday's and Lenz's Laws of Electromagnetic Induction
Electromagnetic induction is the process by which an electromotive force (e.m.f.) or current is produced in a conductor when there is a change in magnetic flux linked with it. The phenomenon was discovered by Michael Faraday in 1831 and later explained further by Heinrich Lenz.
Electromagnetic induction forms the working principle of generators, transformers, electric motors, induction cookers, microphones, and many modern electrical devices.
1. Faraday's Laws of Electromagnetic Induction
First Law of Electromagnetic Induction
Faraday's first law states that:
»Whenever there is a change in magnetic flux linked with a conductor or coil, an electromotive force (e.m.f.) is induced in the conductor.
If the conductor forms a closed circuit, the induced e.m.f. causes an induced current to flow.
Conditions Necessary for Induction
An induced e.m.f. can be produced when:
