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Electromagnetic theory miscellaneous

Electromagnetic Theory

  1. The incoming solar radiation at a place on the surface of the earth is 1.2 kw/m2. The amplitude of the electric field corresponding to this incident power is nearly equal to—
    1. 80 m V/m
    2. 2.5 V/m
    3. 30 V/m
    4. 950 V/m
Correct Option: D

From the Poynting vector, we have

Pav =
1
|E|2

where, η = 377 Ω for free space
E = √Pav × 2 × n
= √1.2 × 103 × 377 × 2
= 951.2 V/m



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