Question

What is proportional to the magnitude of the induced emf in the circuit?

(a) Rate of change of current in the circuit

(b) Rate of change of resistance offered

(c) Rate of change of magnetic flux

(d) Rate of change of voltage

This question was posed to me during an interview.

I want to ask this question from Faraday’s Law of Induction topic in section Electromagnetic Induction of Physics – Class 12

Answer 1

The correct option is (c) Rate of change of magnetic flux

Best explanation: The magnitude of induced emf is equal is equal to the time rate of change of magnetic flux. It is mathematically expressed as:

ε = \(\frac {-d\phi }{dt}\)

The negative sign indicates the direction of the emf induced. This is Faraday’s second law of electromagnetic induction.