本题目来源于试卷: Physics Unit20: Magnetism，类别为 通用国际物理
[单选题]
A proton travels at a sp5 qt 7;ho za6eiar7;qheed of utajq f;u+ 4n.rb;qd:.nzw9 q$5.0 \times 10^7 \; m/s$ through a 1.0-T magnetic field. What is the magnitude of the magnetic force which acts on the proton if the angle between the proton's velocity and the magnetic field vector is $30^{\circ}$?
A. $2.0 \times 10^{-14} \; N$
B. $4.0 \times 10^{-14} \; N$
C. $2.0 \times 10^{-12} \; N$
D. $4.0 \times 10^{-12} \; N$
参考答案: D
本题详细解析:
暂无
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