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Curl cannot be employed in which one of the following?

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in Electromagnetic Theory by (188k points)
Curl cannot be employed in which one of the following?

(a) Directional coupler

(b) Magic Tee

(c) Isolator and Terminator

(d) Waveguides

The question was asked in an online interview.

My question is taken from Vector Calculus topic in chapter Vector Calculus of Electromagnetic Theory

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Best answer
The correct choice is (d) Waveguides

Explanation: In the Directional coupler, Magic Tee, Isolator and Terminator the EM waves travel both in linear and angular motion, which involves curl too. But in waveguides, as the name suggests, only guided propagation occurs (no bending or curl of waves).

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