Click Start to begin the exercise. You will see two charges shown in the box. Click inside the box to draw an electric field line. Remember to allow time for the program to plot the field line before you click again. Draw a number of field lines in the various regions of the box.
1) What is the sign of each charge?
2) From your knowledge of the relationship between electric field lines and equipotential surfaces, describe what you think the equipotential surfaces for these two charges look like.
Submit your answers to parts 1 and 2 in the form below, then browse back and continue with part 3 (below the form).
3) After you have written your answer to part 2), Check yourself.. Now click inside the box to create new electric field lines and see the actual relationship between electric field lines and equipotential surfaces.