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Partially Filled Capacitor

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A capacitor is an electrical device that stores energy. Between its two plates a capacitor can be filled with some material or evacuated to leave a vacuum. A partially filled capacitor is equivalent to two capacitors connected in a series, one with the material and the other empty.

Contributed by: Enrique Zeleny (March 2011)
Open content licensed under CC BY-NC-SA

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The capacitance is

,

where is the percentage of the capacitor filled, the separation between the original plates, the dielectric constant, and the permittivity in a vacuum. Simplifying,

.

In this example, and .

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