Discussion Group Questions 1) What is the definition of an equipotential surface? 2) Why do we measure equipotential lines instead of surfaces in this laboratory? Page 5 3) Indicate those statements below which are true: a) Electric field lines are everywhere parallel to the equipotential lines b) Electric field lines may intersect other field lines c) Electric field lines are everywhere perpendicular to the equipotential lines d) Equipotential lines will never cross other equipotential lines