The nuclear charge (Ze) is nonuniformly distributed within a nucleus of radius R. The charge density p(r) (change per unit volume) is dependent only on the radial distance r from the center of the nucleus as shown in figure, the electric field is only along the radial direction.
The electric field r=R is
(A) Independent of a
(B) Directly proportional to a
(C) Directly proportional to 2 a
(D) Inversely proportional to a
