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## Homework Statement

The parameters of an air-filled parallel plate capacitor are: d = 5mm and A = 500cm2. The

charge of the electrodes are Q = 10nC and −Q. Inside of the capacitor in the middle point

there is a point charge of 0, 02Q. Find the magnitude of the force acting to the point charge!

## Homework Equations

I'm guessing these formulas

C=Q/V = ε0 * A/d

V = E*d

## The Attempt at a Solution

The answer is supposed to be 4.52 * 10

^{-6}N

However I plug in the values and get 9.02 N.. Am I using the wrong formulas, or am I just calculating it wrong?