Two Identical Conducting Spheres a and B Carry Equal Charge

Multiple Choice

Two identical conducting spheres A and B carry equal charge and exert electrostatic forces of magnitude F on each other.They are separated by a distance much larger than their diameters.A third identical conducting sphere C is uncharged.Sphere C is first touched to A, then to B, and finally removed.As a result, the electrostatic force between A and B becomes:

A) F/2
B) F/4
C) 3F/8
D) F/16
E) 0