Fig illustrates a basic magnetization curve of iron (commerical purity grade). Using tis plot, draw th permeability `mu` as a function of the magnetic filed strength `H`. At what value of `H` is the permeability the greatest ? What is `mu_(max)` equal to ?

Explanation

One has to draw the graph of `mu = (B)/(mu_(0) H)` versus `H` from the given. The `mu - H` graph starts out horizontally, and then rises steply at about `H = 0.04 k A//m` before falling again. It is easy to check that `mu_(max) = 10,000`.