Multiple choice

A rectangular metal wave-guide filled with a dielectric material of relative permittivity $\epsilon_r$ = 4 has the inside dimensions 3.0 cm $\times$ 1.2 cm. The cut-off frequency for the dominant mode is

  1. 2.5 GHz

  2. 5.0 GHz

  3. 10.0 GHz

  4. 12.5 GHz

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A Correct answer
Explanation