7.23 The switch in the circuit in Fig P7.23 has been in the left position for a long time. It moves to the right position and stays there. Write the expression for the capacitor voltage, v(t), for t ≥ 0. b) Write the expression for the current through the 40 kΩ resistor, i(t), for t ≥ 0.
Figure P7.23
5 kΩ
40 kΩ
120 Ω
10 kΩ
160 nF
25 kΩ
ω = 1 kΩ
7.44 The switch in the circuit in Fig: P7.44 has been open for a long time before closing. Find i(t) for t ≥ 0.
Figure P7.44
40 mH
60 Ω
50 Ω
10 Ω
15 Ω
I0A
140 V
0.10 Ω