9. In the figure below, $R_1 = 10.0 \text{ k}\Omega$, $R_2 = 15.0 \text{ k}\Omega$, $C = 0.400 \text{ }\mu\text{F}$, and the ideal battery has emf $\mathcal{E} = 15.0 \text{ V}$. First, the switch is closed a long time so that the steady state is reached. Then the switch is opened at time $t = 0$. What is the current in resistor 2 at $t = 4.00 \text{ ms}$?
C
$\mathcal{E}$
$R_2$
$R_1$
Problem-9