Two identical metal spheres, each with a positive charge q, are separated by a centre-to-centre distance r. What effect will the following change have on the magnitude of the electric force exerted on each sphere by the other:
-one sphere is touched by an identical neutral sphere, which is then taken far away
F2 / F= q1q2 / q1q2
where F is the initial electrical force, and F2 is the final electrical force.
The Attempt at a Solution
I looked at the solutions manual and it says this:
I just don't understand why one of the charges is halved. What does this have to do with the neutral sphere?