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This java applet(pop up) demonstrates properties of vector fields. You may select one of many vector fields from the Setup menu in the upper right.
The applet shows the potential surface of the vector field, with particles following the field vectors. You may click and drag with the mouse to rotate the view. Also some of the field selections have parameters which may be adjusted.
This version only does 2-D fields, it can display the potential surface, curl, and divergence, and can also demonstrate Green's theorem and the divergence theorem.
Zip archive of this applet.
Version 1.3, posted 2/22/05