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Fluff for the day

I asked what I think is kind of a cute question (not hard, just
cute) on yesterday's midterm. Can you guess what most students
said?

What charge, placed at the empty corner of the square, will cause
the total electric potential energy of the configuration to be
zero?

-Q............
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Q...........Q

John Mallinckrodt mailto:ajm@csupomona.edu
Cal Poly Pomona http://www.csupomona.edu/~ajm