The function of a dielectric in a capacitor i | vedclass

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(A) When a dielectric material is inserted between the plates of a capacitor,it gets polarized. This polarization creates an internal electric field $

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to reduce the effective potential on plates.

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(A) When a dielectric material is inserted between the plates of a capacitor,it gets polarized. This polarization creates an internal electric field $E_i$ that opposes the external electric field $E_0$ produced by the charges on the plates.The net electric field between the plates becomes $E = E_0 - E_i$,which is less than $E_0$.Since the potential difference $V$ is related to the electric field by $V = E \cdot d$ (where $d$ is the distance between the plates),the reduction in the electric field leads to a reduction in the potential difference between the plates.Since $C = Q/V$,a decrease in $V$ for a constant charge $Q$ results in an increase in the capacitance $C$ of the capacitor.

The function of a dielectric in a capacitor is

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