RC Circuits: For the circuit shown in the figure, V = 20 V, C = 10 µF, R = 0.80 M?, and the battery is ideal. Initially the switch S is open and the capacitor is uncharged. The switch is then closed at time t = 0.00 s. What is the potential difference across the resistor 20 s after closing the switch? 
A. 1.6 V
B. 2.0 V
C. 2.3 V
D. 2.6 V
E. 3.0 V
Answer: A
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