A conducting solid sphere  (radius r_i) with charge -q is located at the center of a conducting hollowed sphere (radius r_o) with charge +q. Non-conducting supports are used to hold and maintain the solid sphere at the center of the hollowed sphere. Taking potential to be zero at r = ∞, determine the electric potential (V_r) at i) inside the solid sphere ii) between the two spheres iii) Outside the hollowed sphere. Hint: Potential at a point is the sum of potentials from each sphere.

• A. i) kq(1/r_o - 1/r_i) ii) kq(1/r_o - 1/r) iii) 2kq/r
• B. i) kq(1/r_o + 1/r_i) ii) kq(1/r_o + 1/r) iii) 0
• C. i) kq(1/r_o + 1/r_i) ii) kq(1/r_o + 1/r) iii) 2kq/r
• D. i) kq(1/r_o - 1/r_i) ii) 0 iii) kq(1/r_o - 1/r_i)
• E. i) 0 ii) kq/r iii) 2kq/r
• F. i) kq(1/r_o - 1/r_i) ii) kq(1/r_o - 1/r) iii) 0