Suppose the surface charge density over a sphere of radius R depends on a polar angle `theta` as `sigma = sigma_(0)cos theta`, where `sigma_(0)` is a positive constant. Show that such a charge distribution can be represented ~s a result ofa small relative shift of two uniformly · charged balls of radius R whose charges are equal in magnitude and opposite in sign. Resorting to this representation, find the electric field strength vector inside the given sphere. `[(sigma_(0))/(3in_(0))]`