Electrostatic Potential and Capacitance

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• Summary

A dielectric constant of a substance is the factor by which the capacitance increases from its vacuum value when the dielectric is fully inserted in between the plates of the capacitor.

In the given diagram, a dielectric is inside a parallel plate capacitor.

The electric field inside a capacitor is given by

Ɛ is the permittivity of the substance.

Potential difference between the plates is given by

Where k is dielectric constant of the substance

K = 1 else 

K = Ɛ/Ɛ₀