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Electromagnetic theory miscellaneous

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Electromagnetic Theory

Electromagnetic theory miscellaneous
  1. The time average Poynting vector in W/m2 for a wave

    →→
    E = 24ej (ωt + βz)ay
    V/m in free space is -
    1. -
      2.4
      		→
      az
      ∏


    2. 2.4
      		→
      az
      ∏


    3. 4.8
      		→
      az
      ∏


    4. -
      4.8
      		→
      az
      ∏
Correct Option: A

Time average Poynting vector is given by



→→
E = 24ej (ωt + βz)ay



→→⋅
Ex × Hy



→
|Ey|2 =
-(24)2
 =
2.4
 →az
2 η2 × 120 ∏ ∏


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