Electric Field in Two Dimensions

In this simulation, you can explore the concept of the electric field, in a two-dimensional situation. You can turn on 1 to 5 charged particles, and move a test charge around the plane near these charged particles to sample the electric field, produced by the charged particles, at various points. You can also turn on a grid of field vectors, which show the direction and, qualitatively, the magnitude of the field at a grid of equally spaced points in the plane in which the charged particles are located.

Here are some facts about the electric field from point charges: