Capacitors in Combination: A potential difference of V = 100 V is applied across two capacitors in series, as shown in the figure. If C1 = 10.0 ?F and the voltage drop across it is 75 V, what is the capacitance of C2? 
A. 30 ?F
B. 2.5 ?F
C. 7.5 ?F
D. 3.3 ?F
Answer: A
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