What is magnetisation?

Two materials X and Y are magnetised, whose intensity of magnetisation are 500 A m^(-1) and 2000 A m^(-1) , respectively. If the magnetising field is 1000 A m. then which one among these materials can be easily magnetized ?

Compute the intensity of magnetisation of the bar magnet whose mass, magnetic moment and density are 200 g. 2 A m^(2) and 8 g cm^(-3) ,respectively.

Answer the following questions . a. Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled ? b. Why is diamagnetism , in contrast , almost independent of temperature ? c. If a toroid uses bismuth for its core, will the the field in the core be (slightly ) greater or (slightly ) less than when the core is empty ? d. Is the permeability of a ferromagnetic material independent of the magnetic field ? If not, is it more for lower or higher fields ? e. Magnetic field lines are always nearly normal to the surface of ferreomgnet at every point . (This fact is analogous to the static electric field lines being normal to the surface of conductor at every point). Why ? f. Would the maximum possible magnetisation of paramagnetic sample be of the same order of magnitude as the magnetisation of ferromagnet ?

The following figure shows the variation of intensity of magnetisation with the applied magnetic field intensity for three magnetic materials X, Y and Z. Identify the materials X, Y and Z.