Question

When rate of change of current in a circuit is unity, the induced emf is equal to

• A. total flux linked with the coil.
• B. induced charge.
• C. number of turns in the circle.
• D. coefficient of self induction.

Answer 1

The correct option is D coefficient of self induction.

Induced emf is equal to
$emf=-\frac{d\left(N\varnothing \right)}{dt}=\frac{-d\left(Li\right)}{dt}=-L\frac{di}{dt}$
So, when rate of change of current is equal to unity, emf is equal to coefficent of self inductance.