Analog approximations of transient flux diffusion

The diffusion of stray magnetic fields into conductors is modeled. By considering only the perpendicular axis of a planar magnetic film, then by assuming a rectangular approximation to the stray flux density, the analysis is greatly simplified while identifying the dominant aspects of the interaction. Use of analogous RC transmission line equations permits the representation of instantaneous film switching by the step-response of an electric circuit, which facilitates the estimation of dominant time constants.