Consider three identical metal spheres, A, B, and C.
Sphere A has a charge of -2μC;
sphere B has a charge of -6μC; and
sphere C has a charge of +4μC.
Spheres A and B are
touched together and then separated.
Spheres B and C are
then touched and separated. Does
sphere C end up with an excess or a
deficiency of electrons and how many electrons is it?