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The imaginary part of the complex Poynting vector represents

  • A.power radiated away to infinity
  • B.power stored permanently in the field
  • C.reactive power oscillating without net transfer
  • D.power dissipated as heat in the medium

Answer: C

It corresponds to energy surging into a region and back again each half cycle, exactly as reactive power does in a circuit. Only the real part carries net energy, and near an antenna the reactive part dominates while far away only the real part survives.

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