The Normal Current Density node represents a current density flowing normally from the domain into the shell boundary. This condition is different from the Current Source node since it represents a net current density flowing from the adjacent domain into the shell, and can be used to model, for example, a boundary acting as an electrode.

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 Normal current density Jn (SI unit: A/m2). The default is 0 A/m2.