Network Theory Magnetic Coupling Circuits

Which materials are classified as ferromagnetic based on their permeabilities compared to free space? 

1
Materials with permeabilities the same as that of free space 
2
Materials with permeabilities slightly greater than that of free space 
3
Materials with permeabilities slightly less than that of free space 
4
Materials with permeabilities hundreds and thousands of times greater than that of free space 

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