Coulomb's Law and Electric Field Package Applet Page
Coulomb's Law and Electric Field Package: Coulomb Force Applet
The EJS Coulomb Force model shows the force vectors on charges. Users can change charge of an individual charge and add more charges (maximum: 10).
The Coulomb Force Model was created by Anne Cox, Wolfgang Christian,and Francisco Esquembre using the Easy Java Simulations (EJS) authoring and modeling tool. Exercises written by Anne J Cox.
You can examine and modify a compiled EJS model if you run the program by double clicking on the model's jar file. Right-click within the running program and select "Open EJS Model" from the pop-up menu to copy the model's XML description into EJS. You must, of course, have EJS installed on your computer.
Information about EJS is available at http://www.um.es/fem/Ejs/.