Show that total electric flux over a closed surface due to charge outside the surface is zero?

The electric flux through the surface

If the flux through a closed surface is zero, then

The electric flux through a closed Gaussian surface depends upon

Find electric field due to solid sphere of charge at a point on the surface.

Show that the electric field at the surface of a charged conductor is given bu vecE = sigma/epsilon_0 hatn , where sigma is the surface charge density and hatn is a unit vector normal to the surface in the outward direction.

Show that the electric field due to a point charge is conservative?

What is electriG flux ? Explain how the electric flux through a surface is related to electric field intensity, when the surface is heldinside the electric field.

If the number of electric lines of force emerging out of a closed surface are 10^3 , calculate the charge enclosed by the surface.