Category: Electromagnetic Induction

Electromagnetic Induction is a process in which an electromotive force (e.m.f.) is induced in any conductor whenever there is a change in the magnetic flux linkages through the conductor.

Faraday’s Law of Electromagnetic Induction states that the electromotive force induced in a conductor is proportional to the rate of change of magnetic flux linkages through the conductor.

(Memorise it! It is useful when trying to explain the effects caused by Faraday’s Law)

Lenz’s Law states that the direction of the induced e.m.f. and hence the induced current in a closed circuit, is always such that its magnetic effect opposes the motion or change producing the induced e.m.f.

(Memorise it! It is useful when trying to explain the effects caused by Lenz’s Law)

Applying Fleming’s left-hand rule, the thumb, the index finger, and the middle finger on the left hand are positioned in such a way that they are pointing perpendicular to one another. The thumb will point in the direction of the force, the index finger will point in the direction of the magnetic field, while the middle finger will point in the direction of the conventional current flow.

This rule is also known as the Motor Rule. It is used in situations where electrical energy is converted to mechanical energy, similar to the energy conversion in a motor.