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
d
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a. 
b. 
c. 
d. 
e. 
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