The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is (a) Independent of the distance between the plates (b) Linearly proportional to the distance between the plates (c) Proportional to the square root of the distance between the plates (d) Inversely proportional to the distance between the plates

Answer: (a). F = Q · (σ)/(2ε₀) = (Q²)/(2ε₀ A) Isolated capacitor: Q stays constant, and F has no d in it. So the answer is (a) independent of the distance between the plates.

The electrostatic force between the metal plates of an isolated… | NEET 2018

Q29NEET 2018Easy

Energy Stored & Force between Plates

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

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Answer: (a)

$F = Q \cdot \frac{\sigma}{2\varepsilon_0} = \frac{Q^2}{2\varepsilon_0 A}$
Isolated capacitor: $Q$ stays constant, and $F$ has no $d$ in it.
So the answer is (a) independent of the distance between the plates.

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