Question

The induction coil works on the principle of
$
  (a){\text{ self induction}} \\
  {\text{(b) mutual induction}} \\
  {\text{(c) ampere rule}} \\
  {\text{(d) fleming's right hand rule}} \\
 $

Answer 1

Hint – In this question use the concept that induction coil is composed of more than one coil, this there cannot be self-induction only, as self-induction is associated phenomena of a single coil only. Think of the phenomena that is associated with a two coil system. This will help get the right answer.

Complete step-by-step answer:

The initial type of electrical transformer was the induction coil.
Induction produces an electromagnetic field in a coil to transfer energy to a piece of work that needs heating. When the electrical current passes along a wire, it produces a magnetic field around that wire.
Thus a flux is generated in the coil due to this magnetic field which connects mutually with the other coil.
Thus induction coil is operated on mutual induction theory.
Mutual induction is the product of an electromotive force in a circuit through a change in the current in an adjacent circuit which is connected to the first by a magnetic field's flux line.
So that's the response they need.
Hence the correct answer is choice (B).

Note – Mutual induction refers to the phenomena of production of electromotive force in a circuit due to the change in current of the adjacent coil. When the current in one coil changes the flux associated with one coil onto the other coil also changes, the other coil tries to oppose this change in flux thus it gives rise to induction. When this process is degraded to a single coil that is when current linked with a coil changes the amount of flux linked with that coil changes so to oppose this change an emf is developed it is called as self-induction.