Question
Question: A 10 mF capacitor is charged to a potential difference of 50 V and is connected to another uncharged...
A 10 mF capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt. The capacitance of second capacitor is –
A
15 mF
B
30 mF
C
20 mF
D
10 mF
Answer
15 mF
Explanation
Solution
Vcommon = 
20 =
, C2 = 15 mF