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 the current (I), given the polarity shown?
A. (VA ? VB) / R
B. VB / R
C. (VB ? VA) / R
D. 0
E. VA / R
Answer: D
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