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True or false: the Poynting vector describes energy travelling inside the conductors of a circuit.

  • A.True, but only in a superconductor
  • B.False, the energy travelling in the field in the space around the conductors
  • C.True, the conductors carrying all the energy
  • D.True, the energy travelling with the drifting electrons

Answer: B

The vector is largest in the space around the conductors, which guide the flow rather than carry it. Within the copper the vector points inward and accounts only for the ohmic loss, not for the power delivered to the load.

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