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]
03.34: A positively charged p26o)ndw lt mc*article o*).4a wo:dpdlaae 5i i/jkbp,bt0 8 udf mass M is at rest on a table. A non- zero electric field E is directed into the plane of the table. A np .5a8 kdt0 i/obbeiulwdd*:)aj,ap4 on-zero magnetic field B is directed out of the plane of the table. What is true about the magnitude of the electric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?
A. $F_E$ >$F_B$
B. $F_E$ <$F_B$
C. $F_E$ =$F_B$
D. It cannot be determined without knowing the exact value of the charge of the particle
E. The relative sizes of the electric and magnetic fields are needed to answer this question
参考答案: A
本题详细解析:
暂无
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