[問題] poynting向量的方向
請問poynting向量的方向"一定"是指向EMW傳播的方向嗎? (不一定吧)
我們可以說poynting向量的方向是能量傳遞的方向,但是能量傳遞的方向不一定就是
電磁波傳遞的方向,對吧!?
以下是維基查到的部分解釋
In a propagating sinusoidal electromagnetic plane wave of a fixed frequency,
the Poynting vector oscillates,always pointing in the direction of propagation.
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