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Learnphysics

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"Using BH curves find the maximum permeability of the cast iron forming the magnetic path."

Now from wikipedia I know that the permeability of cast iron should be around 0.25H/m.

What I don't understand is how to get this quantity from a B-H curve like this one:

http://imgur.com/eiv6IuN

Now what I do understand is that permeability is given by B/H essentially. That would imply it is the gradient of these lines.

So to find the maximum permeability all we need to d is find the point with the most positive gradient.

Is this logical correct?