GATE EC 1990 Electromagnetics Solution Q 2

GATE EC 1990 Electromagnetics Solution Q 2

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

(a) 80 mV/m

(b) 2.5 V/m

(c) 30 V/m

(d) 950 V/m

Ans : d)

Explanation

P=\frac{E^2}{2\eta} E=\sqrt{2\eta P} \eta=\eta_0=120\pi P=1.2kW/m^2=1200W/m^2 E=\sqrt{2\times\left(120\pi\right)\times\left(1200\right)} E\cong950V/m

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