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An electron at 3 × 10^7 m/s moves perpendicular to a 6 × 10^-4 T field. Orbit radius?
A56 cm
B14 cm
C28 cm
D2.8 cm
Answer & Solution
Correct answer: C. 28 cm
r = mv/eB = (9 × 10^-31 × 3 × 10^7)/(1.6 × 10^-19 × 6 × 10^-4), which is about 0.28 m.
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