A charged particle moves in a region of uniform magnetic field along a helical path (radius = 4.0 cm, pitch = 20 cm, period = 2.0 ms). What is the speed of the particle as it moves along this path?
A. 0.13 km/s
B. 0.10 km/s
C. 0.16 km/s
D. 0.23 km/s
E. 0.06 km/s
Answer: C
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