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

1. independent of the distance between the plates
2. linearly proportional to the distance between the plates
3. inversely proportional to the distance between the plates
4. proportional to the square root of the distance between the plates

Correct answer: independent of the distance between the plates

Solution

The electrostatic force between the plates of a parallel plate capacitor depends only on the charge Q and the area A, and is independent of the distance between the plates. This is because the force is determined by the surface charge density and the electric field, which are not affected by the plate separation.

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