Question

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) 0.172 I have been asked this question during a job interview. This intriguing question originated from Transients in chapter Waveguides of Electromagnetic Theory Select the correct answer from above options Electromagnetic Theory questions and answers, Electromagnetic Theory questions pdf, Electromagnetic Theory question bank, Electromagnetic Theory questions and answers pdf, mcq on Electromagnetic Theory pdf,electromagnetic theory book pdf,electromagnetic theory pdf notes,electromagnetic theory lecture notes,electromagnetic theory of light,maxwell electromagnetic theory,electromagnetic theory proposed by,electromagnetic theory engineering physics,electromagnetic theory nptel

Answer 1

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.