Magnetic permeability of ferromagnetic substance is

Give the range of magnetic permeability for a ferromagnetic substance .

A magnetising field intensity of 1000 A/m produces a magnetic flux density 0.25 (Wb)/ m^2 in a ferromagnetic substance. The relative permeability of ferromagnetic substance is (Approximately)

A magnetising field intensity of 1000 A/m produces a magnetic flux density 0.25 (Wb)/ m^2 in a ferromagnetic substance. The relative permeability of ferromagnetic substance is (Approximately)

The relative magnetic permeability of a diamagnetic substance is

The relative magnetic permeability of a diamagnetic substance is

Magnetic lines of force prefer to pass through ferromagnetic substances than air,because permeability for ferromagnetic substances is