Question

Charges $Q_1$ and $Q_2$ are given to two plates of a parallel plate capacitor. The capacity of the capacitor is $C$. When the switch is closed, mark the correct statement(s): (Assume both $Q_1$ and $Q_2$ to be positive)

• A. The charge flowing through the switch is zero.
• B. The charge flowing through the switch is $Q_1+Q_2$
• C. Potential difference across the capacitor plate is $Q_1/C$.
• D. The charge of the capacitor is $Q_1$

Answer 1

Answer: (B), (C), (D)

The charge flowing through the switch is $Q_1+Q_2$
Potential difference across the capacitor plate is $Q_1/C$.
The charge of the capacitor is $Q_1$

When the switch is closed then the whole charge will flow through it.
B) So, total charge$=(Q_1+Q_2)$
C)The potential difference across the capacitor will be $V=\frac{Q_1}{C},[Q_2=0]$
Since the charge $Q_2$ will go to ground.
D) The charge of the capacitor is $Q_1$