It's well known that classical electrodynamics is $C$, $P$ and $T$ invariant. For example, see this question Maxwell's equations and $C$, $P$, $T$ Symmetry. Are there theorems within CED that are a consequence of any of these symmetries?
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$\begingroup$ This is probably a list-based question, but maybe look into Helmholtz reciprocity. $\endgroup$– knzhouCommented Oct 5, 2023 at 21:57
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