Line Charge (on Axis)
For 2D axisymmetric components, use the Line Charge (on Axis) node to specify line charges along the symmetry axis.
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.
Line Charge (on Axis)
Enter a value or expression to apply a Line charge QL (SI unit: C/m). This source represents electric charge per unit length and the default is 0 C/m.
Line Charge and Line Charge (Out-of-Plane)