A thin iron ring with mean diameter d = 50 cm supports a winding consisting of N = 800 turns carrying current I = 3.0 A. The ring has a cross-cut of width b = 2.0 mm. Neglecting the scattering of the magnetic flux at the gap edges, and using the plot shown in Fig. 3.76, find the permeability of iron under these conditions.

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B,T 1,5 10 0.5 Basic magnetization curve of iron (commercial purity grade) H, KA/m 0.6 0.5 0.1 0.4 0.3 0.2