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 kv od :((mcyu*f kbs74 r*m a/ ,akj0i gt vh*9qc29bxelong wires are arranged as shown in the accompanying 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 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 tot eag9kc 20b9xt*h/vr amqj,*ial 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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