In the case 12835: Iron Sphere in a 13.56 MHz Magnetic Field, the Impendance Boundary Conditon is applied. There are two solutions mentioned in the pdf of application files (shown in the following paragraph) and the first solution (Delete operation) is applied successfully in the mph file. So I just consider how to use the second solution successfully after my failed works. The interior of the sphere is explicitly removed from the geometry by means of a Delete operation. An alternative approach is to modify the selection of the Magnetic Fields interface to exclude the interior of the sphere, without deleting the corresponding geometrical domain. This second solution can be useful for example in multiphysics applications when another physics interface (such as Heat Transfer) must be solved in the core as well.
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