1. The problem statement, all variables and given/known data For the magnetic circuit: Derive the circuit approximation. Compute all magnetic fluxes if the total solenoid current is I. 2. Relevant equations Rm = L / μS 3. The attempt at a solution Mostly, right now, I'm just trying to determine the magnetic circuit equivalent. From there it seems like simple circuit analysis. (Note that in my recreation of the diagram, I failed to add in the small L5 annotated at the top right of the larger subcircuit). Is my intuition correct in treating the different media as a parallel of three resistances? This one is a bit strange, I can't find any solid worked examples of this type with differing media. edit: The two resistances Rg1 and Rg2 represent the air-gap.