The initial magnetization curve of commercially pure iron is shown in Fig. 29.9 a. Using the graph, find the value of the magnetic permeability of this material at magnetic field strengths: 50; 75; 100; 200; 500; 1000; 1500 A/m. Draw a graph of magnetic permeability versus field strength. Using the graph, estimate at what field strength the maximum magnetic permeability (mmax) is achieved and what it is approximately equal to.

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