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What is the electrostatic force between the metal plates of a capacitor?

1. Electrostatic force is proportional to Q^2/2ε₀
2. Electrostatic force is proportional to Q/ε₀
3. Electrostatic force is proportional to Q^2/ε₀
4. Electrostatic force is proportional to Q^2/4ε₀

Correct answer: Electrostatic force is proportional to Q^2/2ε₀

Solution

The electrostatic force between the plates of a capacitor is derived from the energy stored in the electric field. It is proportional to Q²/2ε₀A, where A is the area of the plates. Thus, the correct proportionality is Q²/2ε₀.

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