Section 12.2: Core Material
N´I (mmf) = H´l where l is the length (in m) of the core, \ for a given mmf, the amount of flux produced in the core (f = B´A, A = core area) depends on the core material as depicted in the (prototypical) B-H curve shown above
H = Magnetic field intensity (material independent) in A/m
B = Flux density (per unit area) in Tesla (1 T. = 1 Wb./m2)
m = Permeability of core material (constant in region b only)
m0 = Permeability of free space (e.g., air) = 4p´10-7 H/m
mr = Relative (to m0) permeability in pu