[問題] 電磁波問題
以下是我的問題
請問有神人可以幫我解答嗎?
Consider two distinct fields Ea,
Ha and Eb,Hb,which are not necessarily
related.
Suppose that the two fields are harmo
nic functions of the time with the same
frequency.
(1) Shat that
▽˙(Ea×Hb-Eb×Ha)=0
This is know as Lorentz‵s lemma.
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