Define intensity of electric field at a point. Derive an expression for the intensity due to a point charge.

Derive an expression for the electric potential due to a point charge.

Define intensity of light.

Define electric flux. Applying Gauss's law and serive the expression for electric intensity due to an infinite long straight charged wire. (Assume that the electric field everywhere radial and depends only on the radial distance r of the point from the wire.)

Derive an expression for the intensity of the electric field at a point on the axial line of an electric dipole.