The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Point Charge Electric Potential Model.

hanges made:

added text array Q1, Q2, Q3 Q4 etc.
added visualization colormode range from 0 to 9
redesign the control panel to at the bottom
table of the right
made surface appear together with the charges for self manipulation to get 3D superposed view