Suppose we have a coil wound onto a ring of material with relative permeability µ_r.

Provided that the relative permeability µ_r >> 1, then the magnetic flux lines will stay inside the core and the flux density is constant all the way round the core (assuming the cross sectional area of the core is constant) 

Posted Date: 8/27/2012 4:32:30 AM | Location : United States

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