A square waveguide carries TE11 mode whose axial magnetic

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A square waveguide carries TE11 mode whose axial magnetic field is given by:
H_z = H₀cos πx cos πy A/m
√8 √8

Where the waveguide dimensions are in centimetres. What is the cut-off frequency of the mode?

1. 5 GHz
2. 7·5 GHz
3. 6·5 GHz
4. 8 GHz

Correct Option: B

NA