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 waz qsc 6;lrtit(pt h/ qxz(.nrw2/0l*wve has an eleaeq d9n syi0;j2bnkmqv. )+5actric field given by the expression (in Cartesian coordinates):
k 9 y;5va2ajn.0qimsd+bq )ne
$\overrightarrow{E}(x,t)\:=\:6.0cos(1.14\times\:10^7x-3.34\times\:10^{15}t)\overrightarrow{z}$
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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