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The modes in a material having a V number of 20 is(a) 20(b) 400(c) 200(d) 100I got this question in a national level competition.I want to ask this question from Properties of Waveguides topic in portion Waveguides of Electromagnetic Theory

Answer»

Correct answer is (C) 200

Easiest EXPLANATION: The RELATION between the MODES and the V number is given by m = v^2/2. Given that v = 20, we get m = 20^2/2 = 200 modes.



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