Capacitance of a Parallel Plate Capacitor

Parallel plate capacitor consists of two conducting plates parallel to each other and separated by a distance which is small compared  with  the dimensions of the plate.

Let A be the area of each plate separated by a distance d in vacuum and +q and -q are the charges given to the plates.

The charges on each plate are attracted by the charges on the other plate. So the charges spread out uniformly on the inner surfaces of the plates and produce an electric field E between the two plates. Continue reading “Capacitance of a Parallel Plate Capacitor”

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Capacitor and capacitance


It is a device capable of storing a huge amount of electrical charges on its plates. Thus it is a device for storing energy in the electric field between its plates.

Generally it consists of two insulated conductors close together, and carrying equal and opposite charges. The conductors are called the plates of the capacitor.

Capacitance C

It is defined as the ratio of the magnitude of the charge q on either plate to the potential difference V between the plates

C = q/V

Capacitance C of a capacitor is a measure of its capacity of storing charges.

Capacitance of a capacitor depends upon its shape, size and the relative permittivity of the medium between the plates. Continue reading “Capacitor and capacitance”

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