Motion of charged particle and Velocity selector and Mass spectrometer (id: 1db0

本题目来源于试卷: Motion of charged particle and Velocity selector and Mass spectrometer，类别为 美国物理杯赛(Physics Bowl)

[单选题]
94.30: The conventional current I in a lonth*b g:ki0pc6g straight-f ab9 u+* q2iggmfdq- wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire and heading directly toward it, the force on g -+f-*9bgmfq2uiqd athe proton is:

A. $\frac{{\mu }_0{I}^2}{2\pi }$ toward the wire.
B. $\frac{{\mu }_0{I}^{2}L}{2\pi R}$ upward (in the same direction as I).
C. $\frac{{\mu }_0{I}^{2}L}{2\pi R}$ downward (in the opposite direction to I).
D. ev$\frac{{\mu }_{0}I}{2\pi R}$ upward (in the same direction as I).
E. ev$\frac{{\mu }_{0}I}{2\pi R}$ downward (in the opposite direction to I).


参考答案:  E


本题详细解析: 暂无

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