• Initially, $V_1(0^-) = 3V$, and both $SW_1$ and $SW_2$ are open so that $V_o(0^-) = V_2(0^-) = 0$.
• At $t = 0$, $SW_1$ is closed.
• At $t = 2$ ms, $SW_2$ is closed. At the same time, $SW_1$ is opened.
$R_1 = 1 k\Omega$, $C_o = 1\mu F$, $C_1 = 4\mu F$, and $C_2 = 2\mu F$.
(1) Find the general equation of $V_1(t)$ expressed with $R_1$, $C_o$, and $C_1$ for $0 \le t < 2$ ms.
(2) What is the value of $V_1(t)$ at 1.6 ms?
(3) What is the value of $V_1(t)$ at 2.5 ms?