Questions 135-136

A spherical shell with an inner surface of radius a and an outer surface of radius b is made of conducting material. A charge +Q is placed at the center of the spherical shell and a total charge -q is placed on the shell.
135. How is the charge −q distributed after it has reached equilibrium?
(A) +Q on the inner surface, −q−Q on the outer surface.
(B) The charge −q is spread uniformly between the inner and outer surface.
(C) −Q on the inner surface, −q+Q on the outer surface.
(D) −Q on the inner surface, −q on the outer surface.