From the developer: "Shows electric potential and E lines of many kind of charges in 2D and 3D. written to help students visualize electrostatics. It's useful for both college and high school students. Features: 1) Dealing with many kinds of charges: Point, Linear and Page charges with limited or unlimited length, Conductive spheres and Di electric boundaries; 2) Drawing 2D equipotential surfaces and 2D & 3D electric field lines and charges in space; 3) Topographical and colored view of potential, E field value and energy density; 4) Accurate calculations. It finds potential by REAL mathematical integration (not inaccurate numerical calculation of integrals); 5) Drawing the route of a projectile charge influenced by other charges."