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An electron moves in a circle of radius r = 5.29 × 10-11 m with speed 2.19 × 106 m/s. Treat the circular path as a current loop with a constant current equal to the ration of the electron’s charge magnitude to the period of the motion. If the circle lied in a uniform magnetic field of magnitude B = 7.10 mT, what is the maximum possible magnitude of the torque produced on the loop by the field?
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Fundamentals of Physics, Volume 1, Chapter 1-20
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