(a) Using Gauss law, drive an expression for the electric field intensity at any point outside a uniformly charged thin spherical shell of radius R and charge density σC/m2. Draw the field lines when the charge density of the sphere is (i) positive, (ii) negative
(b)A uniformly charged conducting sphere of 2×5m in diameter has a surfaces density of 100mC/m2 . Calculate the (i) charge on the sphere (ii) total electric flux passing through the sphere.