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An electron traveling at relativistic speed moves perpendicularly to a magnetic field of 0.20 T. Its path is circular, with a radius of 15 m. Find (a) the momentum, (b) the speed, and (c) the kinetic energy of the electron. Recall that, in nonrelativistic situations, the magnetic force gvfi furnishes the centripetal force mv^2/r. Thus, since p = mv it follows that p = qBr and this relation holds even when relativistic effects are important. |
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