A magnetic field of 0.1T forces a proton beam of 1.5 mA to move in a circle of radius 0.1 m. The plane of the circle is perpendicular to the magnetic field. Of the following, which is the best estimate of the speed of a proton in the beam as it moves in the circle? Select an answer and defend it.
a) 10-2 m/s
b) 103 m/s
c) 106 m/s
d) 108 m/s
e) 1015 m/s
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