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A coaxial cable carries 100 V between conductors and 2 A to a load. The power crossing any cross-section of its dielectric is

  • A.50 W
  • B.100 W
  • C.zero
  • D.200 W

Answer: D

Integrating the Poynting vector over the annular cross-section returns exactly the product of the voltage and the current. That agreement between the field and circuit calculations is the standard demonstration of the theorem.

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