magnet and magnetic field lines (id: 029dac385)

本题目来源于试卷: magnet and magnetic field lines，类别为 美国物理杯赛(Physics Bowl)

[单选题]
04.31: Two very long current-carrying wires are shown end on in7v7 uy y*ojz,c e(lyy9 the +3qz 9mxbpxbu ) lk:n4figure below. The wirek +3x zx)4un9lb:b pqm on
the left has a 4A current going into of the plane of the paper and the wire on the right has a 3A
current coming out of the paper. Disregarding the case of x → ±∞, in which region(s) could the
magnetic field from these two wires add to zero on the x-axis.

A. Region I only.
B. Region II only.
C. Region III only
D. Regions I & III only
E. In none of the regions


参考答案:  C


本题详细解析: 暂无

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