Two small, identical conducting spheres A and B are a distance R apart: each carries the same charge Q. (a) What is the force sphere B is exerting on sphere A?(b) An identical sphere with zero charge , sphere C ,makes contact with sphere A and is then moved very far away. What is the net force now acting on sphere A? (c) Sphere C next makes contact with sphere A and is then moved far away. What is the force on sphere A in this third case?​