Q 12-06-101JEE MainJEE Main 2021 (27 Jul, Shift 1)Medium
Consider an electrical circuit containing a two way switch $S$. Initially $S$ is open and then $T_1$ is connected to $T_2$. As the current in $R = 6\ \Omega$ attains a maximum value of steady-state level, $T_1$ is disconnected from $T_2$ and immediately connected to $T_3$. Potential drop across $r = 3\ \Omega$ resistor immediately after $T_1$ is connected to $T_3$ is ______ V. (Round off to the nearest integer)
Numerical value type. Enter your answer.
Answer: 3
With $T_1$ joined to $T_2$, the steady current through $R$ and $L$ is $I = \dfrac{6}{6} = 1$ A (ideal inductor).
When $T_1$ is switched to $T_3$, the inductor keeps its current $1$ A at that instant, and it now flows through $r$.
$V_r = 1\times3 = 3$ V.
Solution by Sreeraj P, M.Sc Physics