The phenomenon of production of induced emf in a coil when a changing current passes through it is-
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Self-Induction
When the current in a coil changes, the magnetic flux linked with that same coil changes, and an emf is induced in it that opposes the change. This is self-induction.
\( \displaystyle e = -L\frac{dI}{dt} \)
Why the other options are incorrect
Option (2) Mutual Induction — Incorrect. Mutual induction is the emf induced in a neighbouring coil when the current in the first coil changes.
Option (3) Flux — Incorrect. Flux is a physical quantity (field × area), not a phenomenon of emf production.
Option (4) Induced current — Incorrect. An induced current is a result of an induced emf in a closed circuit, not the name of the phenomenon.
NCERT (2026-27):
Self-Inductance – “… It is also possible that emf is induced in a single isolated coil due to change of flux through the coil by means of varying the current through the same coil. This phenomenon is called self-induction.”