Create the coil, geometry, and coupling coefficients. Don't think it matters what it is for other than the dimensions and magnitudes, which you should scale anyway. Best place to start is the tutorials from Comsol. Eventually you could create something like that I've attached here.

Thank you D.Christopher, but if you have any guide to create something like that you attached above, pls send it or send the website

did you find an answer? i am really interested,

thanks

I have a sample comsol file I can attach if there still is interest.

I still see a lot of people reading this answer, so I will assume interest in it. I'm attaching a model file (written in Comsol 5) which describes the arrangement illustrated in the figure.