本题目来源于试卷: Physics Unit20: Magnetism，类别为 通用国际物理
[单选题]
A charged particle moves ji( is, k,mer)with a constant speed through;t7u mmh0ge v8 a region where a uniform magnetic field is present. If mmge0 hu ;tv78the magnetic field points straight upward, the magnetic force acting on this particle will be maximum when the particle moves
A. straight upward.
B. straight downward.
C. in a plane parallel to the Earth's surface.
D. upward at an angle of $45^{\circ}$ above the horizontal.
参考答案: C
本题详细解析:
暂无
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