A single-phase line consists of two parallel conductors which form a loop of .

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MPPGCL JE Electrical 28 April 2023 Shift 2 Official Paper

Answer 1

Geometry of single-phase transmission line

A single-phase transmission line consists of two parallel conductors, one carrying the current to the load and the other returning the current. These two conductors form a loop.
In overhead transmission lines, conductors are suspended parallel to each other from poles or towers.
The arrangement of conductors is usually straight and spans across large distances.
Since conductors are aligned in parallel and straight paths, they create a rectangular-shaped loop when seen in cross-section or 3D space.
In contrast, a circular loop would mean the conductors are arranged in a curved or circular shape, which does not happen in typical power transmission.