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Electromagnetic TheoryPoynting Vector

For a uniform plane wave with E=100 V/m and H=0.25 A/m mutually perpendicular and in phase, the instantaneous Poynting-vector magnitude is?

  • A25 W/m²
  • B40 W/m²
  • C100 W/m²
  • D400 W/m²
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Correct Answer: A. 25 W/m²
Explanation: For perpendicular fields, |S|=|E||H|=100×0.25=25 W/m².
Reference: Standard electromagnetic theory: poynting vector
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