## Why are waveguides not used at low frequencies, Electrical Engineering

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Q. Comment brie?y on the following:

(a) Why are waveguides not used at low frequencies?

(b) Why are open-wire lines not generally used as guiding structures at very high frequencies?

(c) What is the velocity of wave propagation in a Te?on (εr = 2.1) coaxial transmission line?

what''s robust?

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