Question

Explain the meaning of the words 'electromagnetic' and 'induction' in the term electromagnetic induction. On what factors does the value of induced current produced in a circuit depend? Name and state the rule used for determination of the direction of induced current. State one practical application of this phenomenon in everyday life.

Answer 1

The word "electromagnetic" means that an electric potential dipole is being produced in a coil due to change in the magnetic field. The word "induction" means that the current has been induced.

The value of induced current produced in a circuit depends on the following factors :

(1) Number of turns in a given coil.
(2) Area of each turn in a coil.
(3) Rate of change of magnetic field

The direction of the induced current is determined by the flaming right-hand rule. It states that when the thumb, the first and the second fingers on the right hand are held so that they are at right angles to each other, and the first finger points in the direction of the magnetic field and the thumb in the direction of the motion of the conductor then the second finger will point in the direction of the induced current in the conductor.

The electrical generator is the practical application of this phenomenon in everyday life.