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In a waveguide, which of the following condition is true always?(a) phase velocity = c(b) group velocity = c(c) phase velocity > c(d) phase velocity < cThis question was addressed to me during an interview for a job.My doubt stems from Phase and Group Velocity topic in division Waveguides of Electromagnetic Theory |
Answer» RIGHT option is (c) PHASE velocity > c Explanation: The phase velocity is always GREATER than the speed of light in WAVEGUIDES. This IMPLIES the group velocity is small. |
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