Question

define an electric field. hence find electric intensity due to a point charge in a material medium​

Answer 1

Answer:

The electric field Intensity at a point is the force experienced by a unit positive charge placed at that point. Electric Field Intensity is a vector quantity. ... Formula: Electric Field = F/q.

Answer 2

Electrostats

Electric fiels can be defined as the force produced by the charge near its sorroundings. Its S.I. unit is volt/ meter, or Newton per Coulomb.

Electric field intensity is the electric force per unit charge experienced by a test charge placed at that point. It can be expressed as,

$E=\frac{F}{q}$

Let's consider a point charge q placed at point O.

Using Gauss law, considering a spherical surface with charge at its center as Gaussian surface,

$E(A)=\frac{q}{\epsilon_0}$

$\implies E(4\pi r^2)=\frac{q}{\epsilon_0}$

$\implies E=\frac{q}{4\pi r^2 \epsilon_0}$

This is the intensity of electric field of the charge placed at distance r.

Note: This is sthe formula for as a medium, if there is any other medium then respected dielectric constant K will be used. For air or vacuum the K is 1.