The coupling of energy from one circuit to another that results from the magnetic field generated by the source conductor.
The transfer of energy from one circuit to another by virtue of the mutual inductance between the circuits. Coupling of two coils by means of magnetic lines of force. In transformers, coupling applied through magnetic lines of force between the primary and secondary windings.
In a typical crossover, coils are not placed close to each other because of the inductive interaction between coils.