Circular Motion of Charges: An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A. 2.2 × 107 m/s
B. 1.9 × 107 m/s
C. 1.9 × 106 m/s
D. 3.0 × 107 m/s
E. 0.80 × 107 m/s
Answer: A
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