Electric field due to a point charge inside a dielectric medium (eg, glass, water, etc.): how does the expression for the electric field due to a positive point charge change in the presence of a dielectric medium with relative permittivity & ?

Explanation:

The electric field due to a positive charge at a distance is given by

Where, q be the charge on the charged particle and r be the distance between the charged particle and the point where electric field is to be calculated.

If the medium is inserted whose dielectric constant is K , then the electric field becomes

As teh value of K is more than 1, so the value of electric field E' is less than E.

It means when the medium is inserted, the electric field becomes reduced.