A proton with a kinetic energy of 0.20 keV follows a circular path in a region where the magnetic field is uniform and has a magnitude of 60 mT. What is the radius of this path?
A. 4.1 cm
B. 2.9 cm
C. 3.4 cm
D. 5.1 cm
E. 2.4 cm
Answer: C
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