Q 12-06-028JEE MainMedium
A $0.4$ H inductor carries a current that increases uniformly from $0$ to $3$ A in $0.2$ s. Find the induced emf in volts.
Numerical value type. Enter your answer.
Answer: 6
Concept. $\varepsilon = L\dfrac{\Delta I}{\Delta t}$.
Step 1. Substitute.
$$\varepsilon = 0.4 \times \frac{3}{0.2} = 6\ \text{V}$$
Answer. $6$.
Solution by Sreeraj P, M.Sc Physics