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The power delivered to a resistor may be computed from the Poynting vector by integrating it over

  • A.the cross-section of the resistor at its midpoint
  • B.the surface of the source supplying it
  • C.the surface of the resistor
  • D.the volume of the resistor

Answer: C

The inward flux of the vector over the closed surface equals the dissipation within, and working it out for a cylindrical resistor returns \( VI \) as it must. It is an instructive exercise because the answer is known independently.

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