Flux/Source
The Flux/Source boundary condition
specifies the tangential component of both electric and magnetic fields. This boundary condition is available when Advanced Physics Options is selected in the Show More Options dialog box on the Model Builder toolbar.
Boundary Flux/Source
Enter values or expressions for the components of the tangential Electric field E0 (SI unit: V/m) and the tangential Magnetic field H0 (SI unit: A/m).