Electric Field
The Electric Field boundary condition
specifies the tangential component of the electric field. This feature can be used to specify a source electric field on the boundary of the conductor.
The Harmonic Perturbation subnode (it is of the exclusive type) is available from the context menu (right-click the parent node) or in the Physics toolbar, click the Attributes menu and select Harmonic Perturbation. For more information see Harmonic Perturbation — Exclusive and Contributing Nodes in the COMSOL Multiphysics Reference Manual.
Electric Field
Enter the value or expression for the components of the Electric field E0 (SI unit: V/m). The defaults are 0 V/m.