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What is the formula of the flux dividing into infinitesimal parts?

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What is the formula of the flux dividing into infinitesimal parts?

(a) flux dividing into infinitesimal parts = mmf producing the flux / permeance of infinitesimal part

(b) flux dividing into infinitesimal parts = mmf producing the flux * permeance of infinitesimal part

(c) flux dividing into infinitesimal parts = mmf producing the flux + permeance of infinitesimal part

(d) flux dividing into infinitesimal parts = mmf producing the flux – permeance of infinitesimal part

I had been asked this question during an interview.

My 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 (b) flux dividing into infinitesimal parts = mmf producing the flux * permeance of infinitesimal part

Easiest explanation: The mmf producing the flux and the permeance of infinitesimal part is calculated. On substitution the flux dividing into infinitesimal parts is calculated.

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