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What Does A Capacitor Do?

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A device which is used to store electric charges is called capacitor. A simplest capacitor consists of two parallel plates separated by a small distance. One of the plate is provided with a charge -Q and the other plate automatically acquires a charge +Q due to electrostatic induction. A potential difference is created between two plated of the capacitor. Equivalently, a battery of potential difference is connected between two plates providing a charge Q to plates of the capacitor. The space between the two plates is filled with an insulator known as dielectric. The charges remain on the inner surface of the plates due to attraction. The charge stored on the capacitor is directly proportional to the potential difference applied i.e.

Q=CV  where C is the capacitance of capacitor

Furthermore, the capacity of a capacitor to store charge is called its capacitance.

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