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 mr8;l-.umbzbl t6i /l has an electric field given by the expressio 5n k.njril1j,n (in Cartesia.rn 1n,5i jjlkn coordinates):
$\overrightarrow{E}(x,t)\:=\:6.0cos(1.14\times\:10^7x-3.34\times\:10^{15}t)\overrightarrow{z}$
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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