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Poynting's theorem is a statement of

  • A.the conservation of momentum carried by the field
  • B.the reciprocity of two coupled circuits
  • C.the conservation of energy in an electromagnetic field
  • D.the conservation of charge in a current-carrying region

Answer: C

It says that the power entering a volume through its surface equals the rate of increase of the energy stored within plus the power dissipated there. Every term follows from Maxwell's equations with no additional assumption.

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