Answer: Transposition primarily helps to reduce voltage unbalance and electromagnetic interference with nearby communication lines, such as telephone lines. The asymmetrical arrangement of conductors creates an unbalanced magnetic field. This field can induce unwanted currents and voltages in adjacent parallel communication circuits, causing noise and signal distortion (often called crosstalk). By transposing the power line conductors, the inductive coupling is neutralized, minimizing the induced voltages and preventing interference. This practice is crucial for the reliability and quality of both power and communication systems.