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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 &?

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Explanation:

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

[tex]E = \frac{1}{4\pi \epsilon _{0}}\frac{q}{r^{2}}[/tex]

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

[tex]E' = \frac{1}{4\pi \epsilon _{0}K}\frac{q}{r^{2}}[/tex]

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.

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