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 in 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.