[" Surface density of charge on a sphere of radius ' "R'" in termsof "],[" electric intensity "E'" at a distance 'r' in free space is "],[(varepsilon_(0)=" permittivity of free space) "]

Surface density of charge on a sphere of radius R in terms of electric intensity E at a distance in free space is (epsi_(0) = permittivity of free space)

SI unit of in_(0) (permittivity of free space) is:

The unit of permittivity of free space (E_0) is :

If sigma is the surface charge density off a charge for a charged sphere of radius R. kept in a medium of dielectric constant K, then the electric intensity at a distance r from its centre where rgtR, is ( epsi_(0) =permittivity of free space)