The Current Source node adds a distributed current source Qj in the equation that the physics interface defines. Use this node with caution as it might violate the current conservation law that is inherent in Maxwell-Ampère’s law.

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

Enter a value or expression for the Current source Qj (SI unit: A/m3). The default is 0 A/m3.