Create complex 2D systems of point charges with FieldExpert and view equipotentials and lines of force! I wrote this Win32 application in 1996, but it still runs on more recent versions of Windows (it even runs on Linux via Wine). It's a good exploration tool for high school and college students. I also wrote a paper analyzing some interesting configurations.
Finite Element Analysis package for electromagnetic, thermal, and stress design simulation with coupled multi-field analysisfeatures a free student edition, as well as a professional edition.
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