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Today in lecture someone asked me to draw a few more magnetic field
lines on the diagram I was making (two wires carrying parallel
currents coming straight out at you). I was sufficiently unconfident
of my ability to produce such a drawing without seriously
misleading them that I declined to do so, stating that reason. What
is needed, of course, is a program which will allow one to draw many
more field lines than are usually drawn in the figures that appear
in textbooks.
Paul J. Camp "The Beauty of the Universe
Leigh