There is a situation, we have an electric field and a magnetic field, both are static. And we know the density of energy is u=E·D/2+B·H/2, so dU/dt=0, but Poynting vector S=ExH is not zero, which means energy is flowing. This confused me. Static field also has energy flux?(adsbygoogle = window.adsbygoogle || []).push({});

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# Poynting vector in static electromagnetic field

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