Consider the three concentric metal spheres shown in Figure. Sphere I is solid, with radius R1. Sphere II is hollow, with inner radius R2 and outer radius R3. Sphere III is hollow, with inner radius R4 and outer radius R5. Initially, all three spheres have zero excess charge. Then a negative charge ???Q0 is placed on sphere I and a positive charge +Q0 is placed on sphere III.

(a) After the charges have reached equilibrium, will the electric field in the space between spheres I and II point toward the center, away from the center, or neither?

(b) How much charge will be on the inner surface of sphere II? Give the correct sign.

(c) How much charge will be on the outer surface of sphere II?

(d) How much charge will be on the inner surface of sphere III?

(e) How much charge will be on the outer surface of sphere III?

(f) Plot E versusr.