
Concept explainers
For the circuit in Fig. 8.58, the capacitor voltage at t = 0− (just before the switch is closed) is:
(a) 0 V
(b) 4 V
(c) 8 V
(d) 12 V
Figure 8.58
For Review Questions 8.1 and 8.2.

Choose the correct option to find the capacitor voltage at
Answer to Problem 1RQ
The correct option form the given choices is (a) 0 V.
Explanation of Solution
Calculation:
Redraw the given circuit as shown in Figure 1.
For the DC circuit, at the steady state condition when switch is open at
Since, the capacitor is open circuited, the voltage across the capacitor at
Therefore, the capacitor voltage at
Therefore, the option (a) is correct and the options (b), (c), (d) are incorrect.
Conclusion:
Thus, the correct option from the given choices is (a) 0 V.
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