일반물리학 2 — Circuits: Problem 9

9 In Fig. 27-24, $R_1 = 10.0 \text{ k}\Omega, R_2 = 15.0 \text{ k}\Omega, C = 0.400 \text{ }\mu\text{F}$, and the ideal battery has emf $\mathcal{E} = 20.0 \text{ V}$. First, the switch is closed a long time so that the steady state is reached. Then the switch is opened at time $t = 0$. For resistor 2 and at time $t = 4.00 \text{ ms}$, what are (a) the current, (b) the rate at which the current is changing, and (c) the rate at which the dissipation rate is changing?