Physics - Capacitor Question with Solution | TestHub

Suppose the pair of plates is connected to positive terminal of the battery and the pair of plates $Q$ is connected to the negative terminal of the battery.From figure, it is clear that we have two capacitors $C_1$ and $C_2$. Positive plates of $C_1$ are connected to positive plate of $C_2$ and negative plate to negative. Therefore $C_1$ and $C_2$ are in parallel. So, $C_p=C_1+C_2=2C=\frac{2{\epsilon }_{0}a}{d}$