Question

A transformer works on the principle of :
A) Self induction
B) Mutual induction
C) Coulomb law
D) Ampere law

Answer 1

A transformer follows a property of coils that allows it to resist a change in the current of another coil. As the current in one coil changes, the flow also changes, thereby inducing EMF in the other coil.

Complete Step by step answer: Voltage transformers can be thought of as an electrical component rather than an electronic component. A transformer is basically a very simple static (or stationary) electro-magnetic passive electrical device, which works on the principle of Faraday's law by converting electrical energy from one value to another.
The transformer uses a common oscillating magnetic circuit by connecting two or more electrical circuits together that are produced by the transformer itself. A transformer works on the principles of "electromagnetic induction" as a mutual induction. Mutual induction is the process by which a coil of wire magnetically induces a voltage in another closely located coil. Then we can say that transformers operate in the "magnetic domain", and transformers derive their name from the fact that they change one voltage or current level to another.
Hence option B is correct

Additional Information: Mutual induction is the process by which a coil of wire magnetically induces a voltage in another closely located coil. Then we can say that transformers operate in the "magnetic domain", and transformers derive their name from the fact that they change one voltage or current level to another. Transformers are able to increase or decrease the voltage and current of their supply without modifying its frequency or the amount of electricity transferred from one coil to another through the magnetic circuit.
A single-phase voltage converter basically consists of two electrical wire coils, one called “Primary Winding” and the other “Secondary Winding”. For this tutorial, we will define the “primary” side of the transformer as the side that normally draws current and the “secondary” as the side that normally draws current. In a single-phase voltage converter, the primary is usually the higher voltage side.

Notes: We use AC voltages and currents alternately in our homes and workplaces. The AC supply can easily be generated at a convenient voltage, (hence the name transformer) converted to a much higher voltage and then distributed across the country and over much longer distances using national grids and cables.