Question

What are some examples of electromagnetic induction?

Answer 1

Hint: In order to understand what are the example and application of electromagnetic induction, we shall first understand what is electromagnetic induction. Electromagnetic induction refers to the production of electromotive force (E.M.F.) due to a magnetic field. We shall see how this E.M.F. is generated and then try to find some examples of electromagnetic induction.

Complete step-by-step solution:
Let us see in detail how this E.M.F. is generated during the process of Electromagnetic induction. When a conductor is placed in a moving (time varying) magnetic field, or when a conductor is moved inside a magnetic field, electromotive force is generated across the conductor. This electromotive force then produces current which flows through the conductor.
The equation for this electromagnetic induction is:
$\Rightarrow V=N\dfrac{d\phi }{dt}$
Where,
V is the induced voltage.
N is the total number of turns in the induction coil.
$\phi $ is the magnetic flux. And,
t is the time taken.
Now, let us see the examples of electromagnetic induction:
(a) Electromagnetic induction in AC generator: This principle is used to generate AC currents by changing the magnetic flux constantly through the conductor under operation. This in turn produces an AC voltage supply and furthermore, an AC current supply.
(b) Electrical transformers: This principle is used in a transformer to convert electrical power supply at one voltage level to electrical power at another voltage level, which may ve higher or lower.
(c) Card Swiping Machines
(d) Wireless access points
(e) Induction cookers
(f) Cellphones
(g) Magnetic flow meters, etc.

Note: The concept of electromagnetic induction was first proposed by Michael Faraday. It should also be noted that one of two components of electromagnetic induction, that is, conductor and magnetic field should be moving with respect to the other for the manifestation of change in magnetic flux through the conductor.