Parallel plate capacitor

The capacitance of flat, parallel metallic plates of area A and separation d is given by the expression above where:

= permittivity of space and

k = relative permittivity of the dielectric material between the plates.

k=1 for free space, k>1 for all media, approximately =1 for air.

The Farad, F, is the SI unit for capacitance, and from the definition of capacitance is seen to be equal to a Coulomb/Volt.

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