What can be said about the work done by a conservative force along a closed path?
a.) It is the force times the total distance travelled, 2piR if the path is circular
b.) It is the force times the total distance travelled in the direction of the force, but since the path is closed, the total work is zero
c.) There is no way to tell from this information, since the path probably isn't circular, so the path is not always perpendicular to the force