A 30- $\mu$ F Capacitor Is Charged to 80 V and Then Connected

Multiple Choice

A 30- $\mu$ 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- $\mu$ F capacitor is 20 V,determine C.

A) 60 $\mu$ F
B) 75 $\mu$ F
C) 45 $\mu$ F
D) 90 $\mu$ F
E) 24 $\mu$ F