Question

The modes in a waveguide having a V number of 20 is (a) 400 (b) 200 (c) 100 (d) 40 The question was asked in an international level competition. This key question is from Transverse Magnetic Waves(TM) in division 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

The correct choice is (b) 200 The explanation: The number of modes in a waveguide is given by m = V^2/2. On substituting for V = 20, we get m = 400/2 = 200 modes.