Question: What Is the formula of the permeance of the flux tube considering unit depth in the flux plotting technique?

Options

A : permeance of the flux tube = permeability in the air * mean width of flux tube * mean length of flux tube

B : permeance of the flux tube = permeability in the air / mean width of flux tube * mean length of flux tube

C : permeance of the flux tube = permeability in the air * mean width of flux tube / mean length of flux tube

D : permeance of the flux tube =1/ permeability in the air * mean width of flux tube * mean length of flux tube

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