Three isolated, identical conducting spheres are suspended by insulating strings.
Sphere 1 can be moved because it is suspended from a hand. Sphere 1 has 1,000 excess electrons, Sphere 2 has 500 excess electrons and Sphere 3 has 250 excess electrons.
Initially, Sphere 1 is brought in contact with Sphere 2 then moved away. Next, Sphere 1 is touched to Sphere 3 and removed.
What is the number of excess electrons on each sphere after the two steps are completed?