The subsequent problems deal with the circuit shown below. Assume that the diode is ideal (i.e., has a 0V forward bias voltage).
If VA=5V and VB=2V, and there is a switch that turns on both voltage sources at the same time, and there is no charge on the capacitor initially, what is voltage VD immediately after the switch is closed (i.e., the circuit is not in steady state yet)?
A. ?3 V
B. 3 V
C. ?2 V
D. 0
E. 2 V
Answer: C
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