Conceptual question:
Suppose we have a configuration of point charges. If the potential of the energy of the system is negative, this means work is positive.
I'm kind of rusty with my mechanics, does the fact that the work is positive mean that to arrange the configuration you have to do work against the electric field? I.e. supply energy via some external force?
In terms of electrostatics, is there a general way of interpreting the sign of potential energy and work?
Best Answer
Rule of thumb for working it out:
This is independent of the choice of where the zero of energy is.