Q 12-06-116JEE MainJEE Main 2020 (9 Jan, Shift 1)Easy
In a fluorescent lamp choke (a small transformer) $100$ V of reverse voltage is produced when the choke current changes uniformly from $0.25$ A to $0$ in a duration of $0.025$ ms. The self-inductance of the choke (in mH) is estimated to be ______.
Numerical value type. Enter your answer.
Answer: 10
$$|e| = L\frac{\Delta I}{\Delta t} \Rightarrow L = \frac{100\times0.025\times10^{-3}}{0.25} = 0.01\ \text{H} = 10\ \text{mH}$$
Solution by Sreeraj P, M.Sc Physics