Question

The two plates are joined by a conducting wire as shown. If the initial capacitance is $C$, then the final capacitance will be -

• A. Zero
• B. $\frac{C}{2}$
• C. $2C$
• D. Infinite

Answer 1

The correct option is D Infinite

Let's connect a battery across the ends of the two plates.


When both plates are connected by a wire, it's a short circuit.

So, the potential difference $\left(\Delta V\right)$ between the plates is zero.

Therefore, from, $C=\frac{Q}{\Delta V}$, the new capacitance will be infinite.

Hence, option (D) is the correct answer.