Does the mode TM30 exists? A. Yes B. No I got this question in

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Does the mode TM30 exists?

A. Yes

B. No

I got this question in an international level competition.

Asked question is from Transverse Magnetic Waves(TM) in portion Waveguides of Electromagnetic Theory

The correct answer is B. No

To explain: Modes in the format of TMmo and TMon does not exist. The given mode is in the form of TMmo, which is does not exist. It is an evanescent mode.