I did a lab where the where two electrodes are equidistant on a paper. on the picture the center line is 5 volts ,left electrode is 0 volts, with an outer electric fields of 3 volts. On the right side its 10 volts max ,with an outer circle field 7 V. I was wondering why the left side makes a rectangular semicircle like that. Is it because th right side has higher voltage? the lab is called Electric Fields and electric Potentials. sorry for the poorly drawn picture.