Multiphysics: RF Electromagnetic Waves under the influence of Magnetic Field Created by a Current Carrying Wire

Hi,

I have a multiphysics problem. I can't figure out how to combine the two physics.

What I want to do is to solve RF EM waves (eigenfrequency) for a certain geometry (I prefer to use a torus therefore a 3D geometry) under the influence of a magnetic field created by a current carrying wire. I have the two physics (Magnetic Fields and Electromagnetic Waves) in my model. I can solve the two problems seperately, no problem.

But how can I make the EM Wave study to use the magnetic field created by the Magnetic Fields study in the solution?

Thanks.