If R = 3.0 k?, C = 6.0 nF, ?1 = 10.0 V, Q = 18 nC, ?2 = 6.0 V, and I = 5.0 mA, what is the potential difference Vb?Va?
A. ?13 V
B. +28 V
C. +13 V
D. ?28 V
E. +2.0 V
Answer: D
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