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? (mel = 9.11 × 10-31 kg, e = 1.60 × 10-19 C)
A) 2.2 × 107 m/s
B) 1.9 × 10-2 m/s
C) 1.9 × 10-30 m/s
D) 3.0 × 106 m/s
E) 8.0 × 106 m/s
Answer: A
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