Drag the square and circles. The colour and sign indicates the charge Squares don't move, circles do. Press green flag to reset.
(!) Making a 3D atom simulator, based on this. Got the 3D engine half done (tad glitchy) and a bunch of formulas on paper so far, so if anybody has any ideas, no is the time to put them on the comments! (!) If you see any glitches or have any ideas, let me know, I'll get to it shortly. Oh yeah! Clone interactions! They do spaz out at times, that is because they get very close, making their acceleration sky rocket... Might make an actual atom simulator at some point, if I manage to get some "strong atomic force". Thanks to HDawg777 for pointing out that gravitational pull is weaker.