For ferromagnetic material, the relative permeability (mu_(r)), versus magnetic intensity (H) has the following shape

The relative permeability (mu_(r)) for air is ............. .

The relative permeability (mu_(r)) of a ferromagnetic substance varies with tamperature (T) according to the curve

The following terms find importance in magnetism . Explain them a. Magnetic permeability (mu) b. Magnetic intensity (H) c. Intensity of magnetisation (I) d. Magnetic susceptibility (X_m)