In this Millikan award lecture, the author articulates the need for a "community consensus knowledge base" of physics education research, for the benefit of education and for the cumulation of knowledge about physics...
This Java applet from The Learning Online Network allows you to plot the electrical potential due to one or more charges. The webpage includes instructions on using the applet.
This is one of the documents from the HowStuffWorks website. It provides a simple explanation on how a Van de Graaff generator works. More interestingly, it includes directions on how to build one.
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