Counter_driven_ coils

I'm new to COMSOL and I'm trying to model the b-field lines of a copper coil matrix and its interactions with an inert copper plate. I've been able to build a geometry and mesh however I've confused on how to "power" the coils. I want to have the coils counter driven in a lattice fashion using an 8[Mhz] sine wave I've tries the RF module and the circuit model but to no avail . Anyone have some insights?

I've also attached what i have to to help anyone visualize

regards