For ferromagnetic material, the relative permeability μr versus magnetic intensity (H) has which of the following shape?

μr=1+IH; as we know I is dependent on H, initialiy value of IH is smaller so value of μr increases with H but slowly but with further increases of H value of IH also increases i.e.,μr increases rapidly. When material is fully magnerised l becomes constant. then with the increase of H (IHdecreases) μr decreases.