A point charge Q is present at the origin. It is surrounded by a charge distribution with density rho_0 that exists between two spherical shells defined by radius a and b (where, b>a). Determine the electric field intensity in all regions. Determine the electric potential in all regions. A sphere with radius a has charge distribution density of rho(r) = ke^-r. Where k is constant. No charges are present beyond radius a. Determine the electric field intensity and potential inside and outside the sphere.