- , Two concentric conducting spherical shells each have a net charge of +1 C and all charges remain at rest. The outer shell has -2 C uniformly spread on its outer surface. . How much charge is suspended within the central cavity (not touching the inner shell)? a) -4 C b) -3 C c) -2 C d) -1 C e)0C . The inner surface of the inner shell is at a potential of 0 V. The inner surface of the outer shell may be at a potential of: a) -2 V b) 0 V c) +2 V d) more than one of the above answers could be correct e) none of the above answers may be correct 2 . When an electron is moved from point A to point B, the potential energy of the system decreases by 2 eV. The potential at A is 0 V. What is the potential at B? a) 0 V b) +2 V c) -2 V d) +4 V e) 4 V The electric field between the plates of an ideal parallel plate capacitor has magnitude 2000 V/m. What is the change in potential energy of the system as a -1C charge is moved from A to B? a) +120 J + + + + + b) +85] 8 _ 55 c) -85J 0.03m (1) +60] 1/ e) -60J 'A