What is the potential of a charged spherical conductor. At any point outside

What is the potential of a charged spherical conductor. At any point on the surface

What is the potential of a hollow charged spherical conductor. At any point inside

The potential of a charged spherical conductor of radius r is 10V. The potential at a point (r )/(2) from its centre is

Define electric flux. Give its SI unit. Using Gauss. law, deduce an expression for the electric field due to a uniformly charged spherical conducting shell of radius R at a point outside