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Apparent Poynting vector contradiction
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[QUOTE="Cryo, post: 6090725, member: 649226"] You have to be careful in computing products of fields when working with complex-harmonic fields. First of all, there is nothing weird about Poynting vector oscillating, it is a bit like if you multiply two sine-functions: ##\sin\left(\omega t\right)^2=\frac{1-\cos\left(2\omega t\right)}{2}## - you get a constant + oscillating part. Now what you were probably after is time-averaged Poynting vector. Given complex harmonic electric field (##\mathbf{E}##) and magntic field (##\mathbf{H}##), the time-averaged Poynting vector is: ##\langle \mathbf{S} \rangle = \frac{1}{2} \Re \left(\mathbf{E} \times \mathbf{H}^{\dagger}\right)## i.e. note the complex-conjugation [/QUOTE]
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Apparent Poynting vector contradiction
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