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The way the generator works is how we explain field lines. I place a
positive test charge at equally spaced (angularly) positions around each
charge and then using all the charges in place, calculate the path that the
test charge would move. That is what is traced. The number of initial
charge positions is fixed and may not be properly chosen in this example to
show all the details. This is really designed just to introduce the idea of
field lines to the class. The way the lines are drawn, one can actually
watch them being generated. With today's really fast machines, it happens
pretty fast, but not too fast (yet) to see.
Rick