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]
11.48: An electromagnetic wav5kq pa rw(ei2jc40.dze has a magt: m--+ t4 nm5etml aka7ffm6dnetic field given by the expression (in Canmmt l 5dkm47+ -tfm:atae6f-rtesian coordinates) $\overrightarrow{B} = 6.0 \times\:10^{-6}cos(2.21\times\: 10^7z − 6.63\times\: 10^{15}t)\overrightarrow{x}$ . At t=0 and position x=y=z=0, what is the direction of the electric field associated with this wave?
A. + x
B. −x
C. +y
D. − y
E. +z
参考答案: D
本题详细解析:
暂无
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