Coupling with electrical circuits can create inductive interference to telecommunications facilities. Which of the following can decrease the coupling effect?

Inductive interference is produced by the magnetic flux linkage between the electrical circuit and the telecommunications circuit, and that mutual inductance is directly proportional to the length over which the two circuits run in parallel. Decreasing the exposure length shortens the zone of magnetic coupling, reducing the total flux linked into the telecommunications conductor and thereby lowering the induced voltage. This is a fundamental countermeasure recognized in telecommunications cabling practice for separating power and signal infrastructure.

Single-phase components adding in phase would reinforce the net electromagnetic field, increasing inductive coupling rather than decreasing it.

Decreasing physical separation between the circuits increases mutual inductance, which strengthens the inductive coupling effect.

Increasing earth resistance degrades the effectiveness of the grounding system and does not reduce the magnetic flux coupling between parallel conductors.