本题目来源于试卷: Wave-EM Wave，类别为 美国物理杯赛(Physics Bowl)
[单选题]
An electromagnetic wave has an/if7ylfy*+ om f.xi9ftm4s2n(je e/jc5jo*p electric field given by the expression (in Cartesian coordie ep j59(j fi.j2c/nmf4*oxt snates):
$\overrightarrow{E}(x,t)\:=\:6.0cos(1.14\times\:10^7x-3.34\times\:10^{15}t)\overrightarrow{z}$
09.49: What is the direction of the magnetic field at time t=0 and position x=0?
A. −x
B. + x
C. −y
D. +y
E. +z
参考答案: C
本题详细解析:
暂无
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