The subsequent problems deal with the switched RC circuit below. Assume that the capacitor has no charge to begin with, and assume that VA and VB are constant dc voltages.
A long time after the switch has been closed (i.e., the circuit is in steady state), what is the correct expression for VR, given the polarity shown?
A. VB
B. VA
C. VA ? VB
D. 0
E. VB ? VA
Answer: D
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