Definition: Permeance is the ease with which flux can be set up in a material is measured.  It is reciprocal of reluctance (S) of the material in the magnetic circuit.
It is denoted by (P) and is measured in Weber per ampere-turn (wb/AT) or Henry (H).
It is analogous to conductance in an electric circuit.

Permeance (P) = 1/ Reluctance

                         P = aµ0µr /l       wb/AT or H

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