本题目来源于试卷: Physics Unit20: Magnetism，类别为 通用国际物理
[单选题]
An electron traveling -guioz:boe7bf0w1r- qe5 pf19vuhjrjo 22sehz1 2ic6-8t vr due north with speed $4.0 \times 10^5 \; m/s$ enters a region where the Earth's magnetic field has the magnitude $5.0 \times 10^{-5} \; T$ and is directed downward at $45^{\circ}$ below horizontal. What force acts on the electron?
A. $2.3 \times 10^{-18} \; N$
B. $3.2 \times 10^{-18} \; N$
C. $2.3 \times 10^{-19} \; N$
D. $3.2 \times 10^{-19} \; N$
参考答案: A
本题详细解析:
暂无
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