An airplane flying at a distance of 30 km from a radio transmitter receives a si

Question

An airplane flying at a distance of 30 km from a radio transmitter receives a signalof intensity 25 µW/m2. The transmitterradiates uniformly over a hemisphere. (a) What is the amplitude of the electric component of the signalat the airplane?
V/m

(b) What is the amplitude of the magnetic component of the signalat the airplane?
T

(c) Calculate the transmission power of the transmitter.
W
(a) What is the amplitude of the electric component of the signalat the airplane?
V/m

(b) What is the amplitude of the magnetic component of the signalat the airplane?
T

(c) Calculate the transmission power of the transmitter.
W

Explanation / Answer

(a)   E = 2c I   = 240 * 25 x 10-6 = 0.000686 V/m (b)   B = E / c =    0.000686 / 3.0 x 108 =2.29*10-12 T (c) Power = I * area = I *2 r2 = 25 x 10-6 * 2* 300002 = 1413.72 W

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