本题目来源于试卷: Physics Unit20: Magnetism，类别为 国际高中通用物理
[单选题]
In a mass spectrometer, a single-charged particle (cha*hap3 1 l/b8kah0a)avh xj xn1rge e) has a speed of p.ti.. bq-eh2:nucv a $1.0 \times 10^6 \; m/s$ and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit is 0.020 m. What is the mass of the particle?
A. $3.2 \times 10^{-28} \; kg$
B. $6.4 \times 10^{-28} \; kg$
C. $1.7 \times 10^{-27} \; kg$
D. $3.1 \times 10^{-31} \; kg$
参考答案: B
本题详细解析:
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