RC Circuits: for the Circuit Shown in the Figure, the Capacitors

Essay

RC circuits: For the circuit shown in the figure, the capacitors are all initially uncharged, the connecting leads have no resistance, the battery has no appreciable internal resistance, and the switch S is originally open. (a) Just after closing the switch S, what is the current in the 15.0-Ω resistor?
A) 0.00 A
B) 1.67 A
C) 2.50 A
D) 3.33 A
E) 5.00 A
(b) After the switch S has been closed for a very long time, what is the potential difference across the 28.0-μF capacitor?
A) 0.00 V
B) 25.0 V
C) 3.33 V
D) 37.5 V
E) 50.0 V