Magnetic capacitance is an alternate name for permeance, (SI unit : H). It is represented by a capacitance in the model magnetic circuit. Some authors use C M to denote magnetic capacitance while others use P and refer to the capacitance as a permeance. Permeance of an element is an extensive property defined as the magnetic flux, Φ Φ , through the cross sectional surface of the element divided by the magnetomotive force, F , across the element' C M = P = ∫ ∫ B ⋅ ⋅ d S ∫ ∫ H ⋅ ⋅ d l = Φ Φ F