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

G1 Physics · Accepted Answer

Step 1: For an isolated capacitor, charge Q remains fixed. Step 2: Surface charge density σ = Q/A, and the field from the other plate Eₒₜₕₑᵣ = σ/(2ε₀). Step 3: Attraction force F = QEₒₜₕₑᵣ = Q²/(2ε₀A), independent of separation d.