A Capacitor of Unknown Capacitance C Is Charged to 100 $\mu$

Multiple Choice

A capacitor of unknown capacitance C is charged to 100 V and then connected across an initially uncharged 60- $\mu$ F capacitor.If the final potential difference across the 60- $\mu$ F capacitor is 40 V,determine C.

A) 49 $\mu$ F
B) 32 $\mu$ F
C) 40 $\mu$ F
D) 90 $\mu$ F
E) 16 $\mu$ F