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The power of a wave having an electric field strength of 12.8 units is(a) 0.217(b) 0.721(c) 0.127(d) 0.172I have been asked this question during a job interview.This intriguing question originated from Transients in chapter Waveguides of Electromagnetic Theory

Answer»

Correct ANSWER is (a) 0.217

Best explanation: The power of a wave is given by P = 0.5 E^2/η, where E is the ELECTRIC field intensity and η is the intrinsic IMPEDANCE. On SUBSTITUTING for E = 12.8 and η = 377, we get P = 0.5 x 12.8^2/377 = 0.217 units.



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