1. The problem statement, all variables and given/known data 2. Relevant equations None 3. The attempt at a solution My thinking was that the positively charged sphere would repel the electrons to the far side of the neutral sphere, creating a repulsive force between the two spheres until they touch and the charge is shared. Since the one sphere is insulating, I'm guessing that means they wouldn't share the charge, but why do they attract each other?