Question

Give any two applications of Faraday’s law of induction in daily life.

Answer 1

Hint: Faraday’s law of induction also known as simply Faraday’s law is the fundamental laws of electromagnetism which help us to understand how a magnetic field interacts with an electric circuit to generate an electromagnetic force. Find out the examples where a coil is placed in a magnetic field or a coil is in contact with a time-varying magnetic flux.

Complete step by step solution:
There are two Faraday’s laws of electromagnetic induction.
Faraday’s First law: It states that whenever there is a change in the magnetic flux linked with the coil, an e.m.f. is induced in that coil.
Faraday’s Second law: It states that the magnitude of induced e.m.f. is directly proportional to the rate of change of magnetic flux through the coil.
$\therefore e\alpha \dfrac{d\phi }{dt}$
Where e is the induced e.m.f. and $\dfrac{d\phi }{dt}$ is the rate of change of magnetic flux linked with the coil.
The applications of Faraday’s law of induction in our daily life are:
Transformer: In the transformer, when a current flowing through the primary coil changes with time, a magnetic flux linked with the secondary coil also changes and this produces an emf in the second coil.
Generator: In the generator, a coil moves in presence of a magnetic field which generates an emf in the coil. In this way, mechanical energy is converted into electrical energy.

Note: The total number of the magnetic line passing a given unit area is called magnetic flux. The first law describes how an e.m.f. is induced in a coil and the second gives the idea about how much e.m.f. is induced in the coil. The Faraday’s laws do not give the direction of e.m.f. induced.