Question

The electrostatic force between the metal plates of an isolated parallel plate capacitor $C$ having a charge $Q$ and area $A$, is

• A. Proportional to the square root of the distance between the plates.
• B. linearly proportional to the distance between the plates
• C. Independent of the distance between the plates.
• D. Inversely proportional to the distance between the plates.

Answer 1

The correct option is C Independent of the distance between the plates.

For isolated capacitor, $Q=\text{constant}$.
$F_{plate}=\frac{Q^2}{2A{ϵ}_0}$
$F$ is independent of the distance between the plates.