The property of a coil by which a counter emf is induced in it when the current through the coil changes is known as
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Self-inductance
When the current in a coil changes, the flux linked with the coil itself changes and an emf is induced in the same coil. This emf opposes the change in current, so it is called the back (counter) emf. The property of the coil that sets its size is the self-inductance \( L \).
NCERT (2026-27):
Summary – “7. When a current in a coil changes, it induces a back emf in the same coil. The self-induced emf is given by,
\( \displaystyle \varepsilon=-L\frac{dI}{dt} \)
L is the self-inductance of the coil. It is a measure of the inertia of the coil against the change of current through it.”