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試卷名稱：110年 - 110 國立臺灣大學_碩士班招生考試_電信工程研究所甲組:電磁學及電磁波#113085
年份：110年
科目：研究所、轉學考(插大)◆電磁學
13. Consider a sheet current source 
at z = 0. The medium on either side of the sheet is free space. Which of the
following statements for the region z ＞0 is not correct?
(A) There will be a wave propagating in the +z direction.
(B) The electric field and magnetic field are in phasc.
(C) The instantaneous power flow out of an arbitrary closed surface is zero.
(D) The average power flow is half of the peak power flow.
