If two points are at the same potential, does this mean that no work is done in moving a test charge from one point to the other? does this imply that no force must be exerted? explain 15)how much work does the electric field do in moving a proton from a point with a potential of +175v to apoint where it is -65v? 16) the electric field between two parallel plates connected to a 55-v battery is 1600 vim. how far apart are the plates? 17) what is the magnitude of the electric field between two parallel plates 3.0mm apart if the potential difference between them is 120 v?