The magnitude of induced emf in a coil depends on the:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → rate of change of magnetic flux linked with the coil
Faraday’s law of electromagnetic induction says that the induced emf in a coil is equal to the rate of change of magnetic flux linked with it, \( \varepsilon = -N\,d\Phi_B/dt \).
Why the other options are incorrect
Option (1) amount of magnetic flux linked with the coil — Incorrect. A large flux that stays constant induces no emf; only its change matters.
Option (2) amount of electric flux linked with the coil — Incorrect. The induced emf is governed by the magnetic flux, not the electric flux.
Option (4) rate of change of electric flux linked with the coil — Incorrect. A changing electric flux produces a displacement current, not the induced emf of Faraday’s law.
NCERT (2026-27):
Faraday’s Law of Induction – “… The magnitude of the induced emf in a circuit is equal to the time rate of change of magnetic flux through the circuit.”