posted by echo .
Consider a system consisting of two oppositely charged spheres hanging by strings and separated by a distance r1, as shown in the accompanying illustration. Suppose they are separated to a larger distance r2 , by moving them apart along a track.
What is the potential energy, postive of negative or reamins the saem?
What effect does it do on the total energy/
What can you say about the q and w in this process?