Question

Across each of two capacitors of capacitance $1\mu F,$ a potential difference of $10V$ is applied. Then positive plate of one is connected to the negative plate of the other, and negative plate of one is connected to the positive plate of the other. After contact:

• A. charge on each is zero
• B. charge on each is same but non-zero
• C. charge on each is different but non-zero
• D. none of the above

Answer 1

Answer: (B)

A capacitor is an arrangement which can store sufficient quantity of charge.
Suppose on giving a charge $q$ to a conductor the electric potential of the conductor becomes $V$.
Then the capacitance of the conductor is
$C=\frac{q}{V}$ When two capacitors are connected as given, then charge will be redistributed in the ratio of their capacitance, so charge on each capacitor will be different but non-zero.