Find the mmf needed to establish a magnetic flux, Electrical Engineering

Q. Consider the toroid shown in figure made up of three ferromagnetic materials. Material a is nickel-iron alloy having a mean arc length la of 0.6 m; material b is medium silicon steel having a mean arc length lb of 0.4 m; material c is cast steel having a mean arc length lc of 0.2 m. Each of the materials has a cross sectional area of 0.002 m2 . Find the mmf needed to establish a magnetic flux of φ = 1.2 mWb by making use of the magnetization curves given in

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