kirchoff's second law

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    How to determine the number of turns of the winding?

    The problem: In the core made of electrical steel (Fig. 1), it is required to create a magnetic flux Φ = 4.2*10^(-3) Wb. Determine the number of turns of the winding, if the current is I = 5 A, and the dimensions of the core are specified in millimeters. Equations that are supposed to be used...