how capacitance of a capcitor is increased when dielectric is introdused?

Asked by  | 2nd Mar, 2008, 04:29: PM

Expert Answer:

The electrons within dielectric molecules are influenced by the electric field, causing the molecules to rotate slightly from their equilibrium positions. The air gap is shown for clarity; in a real capacitor, the dielectric is in direct contact with the plates.

The induced field of the dielectric is in a direction opposite to the field between the plates of the capacitor. As the field decreases, the potential difference between the plates of the capacitor also decreases as V = Ed.

Hence capacitance increases.

Answered by  | 8th May, 2008, 05:18: PM

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