33. Two small spheres have equal charges q and are separated by a distance d. The force exerted on each sphere by the other has magnitude F . If the charge on each sphere is doubled and d is halved, the force on each sphere has magnitude
(A) F
(B) 4 F
(C) 8 F
(D) 16 F
(A) F
(B) 4 F
(C) 8 F
(D) 16 F