Question

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

• A. inversely proportional to the distance between the plates.
• B. independent of the distance between the plates.
• C. proportional to the square root of the distance between the plates.
• D. linearly proportional to the distance between the plates.

Answer 1

Answer: (B)

For isolated capacitor $Q=$ Constant
$F_{\text{plate }}=\frac{Q^2}{2A{\epsilon }_0}$
$F$ is Independent of the distance between plates.