Use the Edge Current node to specify a line current along one or more edges. A positive edge current flows in the direction marked by the red arrow.

Add a contribution as a Harmonic Perturbation by right-clicking the parent node or click Harmonic Perturbation in the Physics toolbar. For more information see Harmonic Perturbation — Exclusive and Contributing Nodes in the COMSOL Multiphysics Reference Manual.

Specify the Edge current I0 (SI unit: A). The default is 0 A.