Question

The working principle of a dynamo is based on:

• A. heating effect of current
• B. electromagnetic induction
• C. induced magnetism
• D. induced current

Hint:

Faraday’s law of electromagnetic induction states that emf is induced in a coil when the magnetic flux linked with it changes.

Answer 1

The Correct Option is B

A dynamo operates on the principle of electromagnetic induction, which states that an electromotive force (emf) is induced in a coil when there is a change in the magnetic flux passing through it. In a dynamo, a coil of wire is rotated within a magnetic field, causing the magnetic flux linked with the coil to vary continuously with time. According to Faraday’s law of electromagnetic induction, this changing flux induces an emf in the coil, which can then drive an electric current in an external circuit. The magnitude of the induced emf depends on the rate of change of the magnetic flux, the number of turns in the coil, and the strength of the magnetic field. This induced emf is the fundamental working principle behind electrical generators like dynamos.