The charges can be moved by dragging and their charge can be adjusted with sliders. In addition, four presets are provided (including random). The points labeled "Field Line", "Strength", and "Vector" can be dragged around to explore the field. Each can be enabled or disabled using the matching check boxes.[br][br][b]For best performance, turn the Field Lines off when adjusting the charges or choosing a preset.[/b]

[list=1][br][*]Use the three tools to explore the electric field for some of the presets.[br][*]Drag the points to make your own charge distribution. Predict what the field will look like and then verify using the tools.[br][/list]