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]
02.15: A positively c s na4z74hz:zalsyi 0f kn,d78 harged particle moves to the right. It enters a region of *z iz2m4 hi b11e1jvel space in which there is an electric field directed up the plane of the paper (see f ve1 i2zm1 z* ehb1l4ijigure). In which direction does a magnetic field have to point in this region so that the particle maintains a constant velocity?
A. Into the plane of the page
B. Out of the plane of the page
C. To the right
D. To the left
E. Up the plane of the page
参考答案: B
本题详细解析:
暂无
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