wow, i was stuck for a while before i realize the Firefox is not 100% compatible with http://www.phy.ntnu.edu.tw/ntnujava/simulationBuilder/
Used the ie and the another charge particle comes out :)
thanks prof for developing such a wonderful tool to bridge teachers with research.
i will develop applets using your tool.
btw, is there any issues with copyright if i make applets using your tools?
can the applets made with your tool belong to my employer ??