# Normal determination to estimate permeability

1. Sep 23, 2011

### thegroovyguru

"normal" determination to estimate permeability

I'm working on a magnetic circuit using a cast steel rectangular core with a .0008m air gap.

There is a hint the question that says, 'Use a "normal" determination to estimate μ from the graph.'

What exactly is a "normal" determination referring to??

Thanks!

2. Sep 24, 2011

### Spinnor

Re: "normal" determination to estimate permeability

This might help, from,

http://yourelectrichome.blogspot.com/2011/05/magnetic-circuit-in-transformer.html

See figure 4. Some of the text nearby,

"... For many engineering applications it is sufficient to describe the material using the dc or normal magnetization curve, which is a curve drawn through the maximum values of B and H at the tips of the hysteresis loops (Fitzgerald et al. 1990). ..."