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

Independent of the distance between the plates

Linearly proportional to the distance between the plates

Inversely proportional to the distance between the plates

Proportional to the square root of the distance between the plates

Solution

Independent of the distance between the plates

The electrostatic force between the metal plates

$F_{p l a t e} = \frac{Q^{2}}{2 A_{ε_{0}}}$

For isolated capacitor Q = constant
Hence, F is Independent of the distance between plates

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