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Electrons in a constant magnetic field undergo circular motion, with a frequency (revolutions per second) of 7.0 x 109 Hz. The electrons have a speed

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Electrons in a constant magnetic field undergo circular motion, with a frequency (revolutions per second) of 7.0 x 109 Hz. The electrons have a speed of 1.2 x 105 m/s. a. Determine the magnitude of the magnetic field strength B. [3 marks] b. Determine the radius of the circular orbit. [2 marks]

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