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The three terms of Poynting's theorem for a volume are the surface power flow, the rate of change of stored energy and

  • A.the ohmic power dissipated within the volume
  • B.the total charge enclosed by the volume
  • C.the magnetic flux threading the volume
  • D.the radiation resistance of the enclosed sources

Answer: A

The dissipation term is the volume integral of \( \sigma E^2 \), which is Joule heating expressed in field quantities. In a lossless region it vanishes and the theorem reduces to a balance between inflow and stored energy.

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