本题目来源于试卷: magnetic force，类别为 美国物理杯赛(Physics Bowl)
[单选题]
94.29: Four infinitely long wires are arranged a ces(tqw rf d(grq/p84a; r x10s shown in the accompanying 8 fps3md (g;kj figure’s end-on view. All four wires are perpendicular to the plane of the page and have the same magnitude of current I. The conventional d(3jgf;8pms k current in the wire in the upper right-hand corner is directed into the plane of the page. The other conventional currents are out of the plane of the page. Point P is a distance a from all four wires. What is the total magnetic field at point P?
A. $\frac{\mu_0I}{2\pi\:a}$ toward the upper left hand corner.
B. $\frac{\mu_0I}{2\pi\:a}$ toward the lower left hand corner.
C. $\frac{\mu_0I}{\pi\:a}$ toward the upper left hand corner.
D. $\frac{\mu_0I}{\pi\:a}$ toward the lower left hand corner.
E. 0
参考答案: C
本题详细解析:
暂无
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