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GATE ECE 2009 | Question: 10

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Which of the following statements is true regarding the fundamental mode of the metallic waveguides shown?

  1. Only $\text{P}$ has no cutoff-frequency
  2. Only $\text{Q}$ has no cutoff-frequency
  3. Only $\text{R}$ has no cutoff-frequency
  4. All three have cut-off frequencies
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