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

changes made:
redesign the panel for control to be bottom
added more options to the menu for ease of use
made the drawing of charges proportional to the charges
made the collision detection to pause when the test charge is inside the charges
added evolution page to reflect the physics of motion
added test mass, m = 1 kg
added trail to show path of test charge that can be drag away and it will start from vx=vy=0