The function of a dielectric in a capacitor i | vedclass

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(B) When a dielectric material is inserted between the plates of a capacitor,it gets polarized. The induced electric field $E_i$ inside the dielectric

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to reduce the effective potential on plates.

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(B) When a dielectric material is inserted between the plates of a capacitor,it gets polarized. The induced electric field $E_i$ inside the dielectric opposes the external electric field $E_0$ produced by the charges on the plates. The net electric field becomes $E = E_0 - E_i$. Since the potential difference $V$ is related to the electric field by $V = E \cdot d$,the reduction in the net electric field leads to a reduction in the effective potential difference between the plates. This reduction in potential,while the charge $Q$ remains constant,results in an increase in the capacitance $C = Q/V$.

The function of a dielectric in a capacitor is

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