Question

3. The switch in the circuit below has been in the left position for a long time. At $t = 0$, it moves to the right position and stays there. 10 k$\Omega$ 5 k$\Omega$ + $i = 0$ + 150 V v 40 nF 30 k$\Omega$ 60 k$\Omega$ a. Find the initial voltage drop across the capacitor. b. Find the initial energy stored by the capacitor. c. Find the time constant for the capacitor. d. Write the expression for the capacitor voltage $v(t)$ for $t \ge 0$. 4. The switch in the circuit below has been in the left position for a long time. At $t = 0$, it moves to the right position and stays there. 2.4 k$\Omega$ $i = 0$ 40 mA 2.7 k$\Omega$ 3.3 k$\Omega$ v 0.5 $\mu$F 3 k$\Omega$ 3.6 k$\Omega$ a. Write the expression for the capacitor voltage, $v(t)$, for $t \ge 0$. b. Write the expression for the current through the 2.4 k$\Omega$ resistor, $i(t)$, for $t \ge 0^*$.

          3. The switch in the circuit below has been in the left position for a long time. At $t = 0$, it moves to the
right position and stays there.
10 k$\Omega$
5 k$\Omega$
+ 
$i = 0$
+
150 V
v
40 nF
30 k$\Omega$
60 k$\Omega$
a. Find the initial voltage drop across the capacitor.
b. Find the initial energy stored by the capacitor.
c. Find the time constant for the capacitor.
d. Write the expression for the capacitor voltage $v(t)$ for $t \ge 0$.
4. The switch in the circuit below has been in the left position for a long time. At $t = 0$, it moves to the
right position and stays there.
2.4 k$\Omega$
$i = 0$
40 mA
2.7 k$\Omega$
3.3 k$\Omega$
v
0.5 $\mu$F
3 k$\Omega$
3.6 k$\Omega$
a. Write the expression for the capacitor voltage, $v(t)$, for $t \ge 0$.
b. Write the expression for the current through the 2.4 k$\Omega$ resistor, $i(t)$, for $t \ge 0^*$.

3. The switch in the circuit below has been in the left position for a long time. At t = 0, it moves to the
right position and stays there.
10 kΩ
5 kΩ
+
i = 0
+
150 V
v
40 nF
30 kΩ
60 kΩ
a. Find the initial voltage drop across the capacitor.
b. Find the initial energy stored by the capacitor.
c. Find the time constant for the capacitor.
d. Write the expression for the capacitor voltage v(t) for t ≥ 0.
4. The switch in the circuit below has been in the left position for a long time. At t = 0, it moves to the
right position and stays there.
2.4 kΩ
i = 0
40 mA
2.7 kΩ
3.3 kΩ
v
0.5 μF
3 kΩ
3.6 kΩ
a. Write the expression for the capacitor voltage, v(t), for t ≥ 0.
b. Write the expression for the current through the 2.4 kΩ resistor, i(t), for t ≥ 0^*.

Added by Sheila T.

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