A 30-?F capacitor is charged to 80 V and then connected across an initially uncharged capacitor of unknown capacitance C. If the final potential difference across the 30-?F capacitor is 20 V, determine C.
A. 60 ?F
B. 75 ?F
C. 45 ?F
D. 90 ?F
E. 24 ?F
Answer: D
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