# Formula: Plate Capacitor Attraction Force    Electric charge    Area    Relative permittivity    Vacuum Permittivity

## Attraction Force

Unit
Force with which the two plates (electrodes) attract each other.

## Electric charge

Unit
Amount of charge on one of the plates. Here it is assumed that both plates contain the same amount of charge, but are charged with different sign (+ and -).

## Area

Unit
Area of one side of the capacitor plate.

## Relative permittivity

Unit
Relative permittivity is a dimensionless number describing the dielectric (e.g. air, water, glass) between the two capacitor plates. In vacuum, the relative permittivity has the value $$\varepsilon_{\text r} = 1$$.

## Vacuum Permittivity

Unit
The vacuum permittivity is a physical constant that appears in equations involving electromagnetic fields. It has the following experimentally determined value: $$\varepsilon_0 ~\approx~ 8.854 \, 187 \, 8128 ~\cdot~ 10^{-12} \, \frac{\mathrm{As}}{\mathrm{Vm}}$$

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