An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 mT, 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
C
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