Question

Fig. 3.76 illustrates a basic magnetization curve of iron (commercial purity grade). Using this plot, draw the permeability μ as a function of the magnetic field strength H. At what value of H is the permeability the greatest? What is μ _max equal to?

Answer 1

One has to draw the graph of  versus H from the given graph. The μ - H graph starts out horizon tally, and then rises steeply at about H = 0.04 k A / m before falling again. It is easy to check that μ _max ≈ 10,000.