In the contributed section at http://vpython.org there is a new program
EMWave.py by Rob Salgado that will be of high interest to those who
teach about electromagnetic waves. Rob has arranged to show not only the
propagating electric and magnetic fields but also their time
derivatives. The time derivative of the magnetic field produces the
electric field, and the time derivative of the electric field produces
the magnetic field, and.....
Thanks, Rob!
Bruce Sherwood
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