Q 12-06-019NEETJEE MainEasy
The current in a $0.2$ H coil changes from $5$ A to $1$ A in $0.1$ s. The self-induced emf is
Answer: (A) $8$ V
Concept. Self-induced emf: $|\varepsilon| = L\dfrac{\Delta I}{\Delta t}$.
Step 1. Substitute.
$$|\varepsilon| = 0.2 \times \frac{5 - 1}{0.1} = 8\ \text{V}$$
Answer. $8$ V (Option A).
Solution by Sreeraj P, M.Sc Physics