An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 ?T, and points in the positive x direction. At t = 0 the electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the radius of the resulting helical path?
A. 4.7 mm
B. 18 mm
C. 3.8 mm
D. 2.8 mm
E. 5.7 mm
Answer: C
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