Homopolar motor: My kind of demo

I used this demo as part of a mini-lesson I did at the interview to get accepted into my current teaching program.  It is a brilliant demonstration of the Lorentz force in a very simple fashion, and one that leads to more advanced discussions of motors and generators as part of a physics class.  See for yourself how easy it is to make a motor:

Try it yourself – great at parties.  Impress your friends!

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