MAGNETIC circuit of opposing the PASSAGE of magnetic flux lines.While Permeance is the reciprocal of reluctance is a measure of magnetic flux for a number of current turns in a magnetic circuit.Permeance = flux/mmf \(Permeance = \frac{\PHI }{{{F_m}}}\) \(Permeance = \frac{{{\MU _0}{\mu _r}a}}{l}\)The SI unit of magnetic permeance is webers PER ampere-turn that is H (henry).Permeance is the measure of the ease with which flux can be set up in a material.In other words, it measures the magnitude of the flux for the number of turns in an electric circuit.The permeance is analogous to the conductance in an electrical circuit.