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Electrons produced by a certain device are observed to travel in a circular path with a radius of 4.4 cm when placed in a uniform magnetic field whose strength is 47 MN/C. What is the speed of the electrons emitted by this device? [You should express this speed as a fraction of c.] Hint: This electron is really moving fast! You should use the fully relativistic expression for momentum p=mv? where ?=(1-(v/c)2)-1/2.

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