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What is the formula of the effective permeance?

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What is the formula of the effective permeance?

(a) effective permeance = effective flux/total mmf

(b) effective permeance = effective flux/mmf of air gap

(c) effective permeance = effective flux * total mmf

(d) effective permeance = effective flux * mmf of air gap

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This question is from Specific Permeance & Calculation of Magnetizing Current in section Principles of Magnetic Circuit Design of Design of Electrical Machines

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The correct option is (a) effective permeance = effective flux/total mmf

Easiest explanation: The effective flux and the total mmf is first calculated. On substitution of the values the effective permeance is calculated.

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