Four students have produced representations in the right box of the electric field they
think produces the electric equipotential lines displayed in the left box. Click on each of
their names and decide which student drew the best representation. The arrows in the field
plot represent the direction and the colors represent the magnitude of the electric
field. You can click-drag in the left-hand display to measure the potential.
Physlet problem authored by Wolfgang Christian and modified by Scott Bonham.