Coulomb's Law and Electric Field package shows correct versions of similar simulations.

The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Electric Field: What is Wrong? Package.

Originally developed by Anne Cox, Wolfgang Christian, and Francisco Esquembre, the EJS Electric Field: What is Wrong? Package has been rejuvenated through the efforts of lookang, who updated it to JavaScript.
Navigating to Model: Using the EJSS authoring toolkit installed, follow these steps: Select "A EJSS digital Library," choose "JS EJS model in Singapore" from the Library, double click the "05electricitynmagnetism_11efield" folder, and then double click on the "CoulombForceWrong" filename. Finally, click the "Download" button. Store the model source code within your EJSS defined workspace/source/ directory.

Using the EJSS authoring toolkit installed here, Select "A EJSS digital Library", in Library select "JS EJS model in Singapore", double click folder "05electricitynmagnetism_11efield", and double click filename "CoulombForceWrong" and click button "Download". Save the model source code inside your EJSS deifned workspace/source/