What is the principle of a Capacitor?

 A capacitor is a device that is used to store charges in an electrical circuit.

 A capacitor works on the principle that the capacitance of a conductor increases appreciably when an earthed conductor is brought near it.

 Hence, a capacitor has two plates separated by a distance having equal and opposite charges.

The space between the conductors may be filled by vacuum or with an insulating material known as a dielectric.

The ability of the capacitor to store charges is known as capacitance.

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