If $\eta=\sqrt{\mu/\epsilon}$ is the wave impedance of a homogeneous infinite medium in which a free-space electromagnetic wave propagates (i.e. plane wave), then we know that the magnitude of the electric and magnetic fields are related by
$$ |E|=\eta |H| $$
Will this simple equation generally hold also for any field at resonance (e.g. say for an electromagnetic field resonating inside some cavity of arbitrary shape) or is it only known to be true for plane waves?
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