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What is the formula of the zigzag specific permeance?

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What is the formula of the zigzag specific permeance?

(a) zigzag specific permeance = average width of the rotor tooth * length / (1/2 * mmf per slot^2)

(b) zigzag specific permeance = average width of the rotor tooth / length * (1/2 * mmf per slot^2)

(c) zigzag specific permeance = average width of the rotor tooth * length * (1/2 * mmf per slot^2)

(d) zigzag specific permeance =1/ average width of the rotor tooth * length * (1/2 * mmf per slot^2)

I had been asked this question in homework.

Question is taken from Pulsation Losses & Types of Leakages in chapter Principles of Magnetic Circuit Design of Design of Electrical Machines

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The correct choice is (b) zigzag specific permeance = average width of the rotor tooth / length * (1/2 * mmf per slot^2)

Best explanation: The average width of the rotor tooth along with the length and mmf per slot is calculated. On substitution the zigzag specific permeance is obtained.

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