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

Answer»

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.



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