Electrostatic Potential & Capacitance
Class 12 · Electrostatic Potential & Capacitance

Force Between Plates

F = Q²/(2ε₀A). Always attractive (opposite sign plates).

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Key Notes

01

Plates of opposite charge attract: F = Q²/(2ε₀A) = ½ε₀E²A.

02

Always attractive, regardless of which plate is +.

03

Note the factor ½ — only ONE plate's field acts on the other (its own field can't push it).

Formulas

Force per plate

Pull toward each other.

Important Points

Electrostatic pressure P = F/A = ½ε₀E².

Used in electrostatic loudspeakers, micromachined sensors.

Force Between Plates notes from sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs, Physics Lab). Class 12 physics revision for JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT, and CUET-UG.