Would the maximum possible magnetisation of a paramagnetic sample be of the same order of magnitude as the magnetisation of a ferromagnet?

Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled?

Explain qualitatively on the basis of domain picture the lireversibility in the magnetisation curve of a ferromagnet.

A domain in ferromagnetic iron is in the form of a cube of side length 1mu m. Estimate the number of iron atoms in the domain and the maximum possible dipole moment and magnetisation of the domain. The molecular mass of iron is 55 g/mole and its density is 7.9 g/(cm)^(3) . Assume that each iron atom has a dipole moment of 9.27 xx 10^(-24) "Am"^(2) .

(a) At what distance should the lens be held from the figure in Exercise 9.29 in order to view the squares distinctly with the maximum possible magnifying power? (b) What is the magnification in this case? (c) Is the magnification equal to the magnifying power in this case? Explain.

Ravi can throw a ball at a speed on the earth which can cross a river of width 10 m . Ravi reaches on an imaginary planet whose mean density is twice that of the earth. Find out the maximum possible radius of the planet so that if Ravi throws the ball at the same speed it may escape from the planet. Given radius of the earth = 6.4 xx 10^(6) m .

A Rowland ring of mean radius 15 cm has 3500 tums of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetising current of 1.2 A?

A paramagnetic sample shows a new magnetisation of 8 "Am"^(-1) when placed in and external magnetic field of 0.6 T at a temperature of 4 K. When the same sample is placed in an external magnetic field of 0.2 T at temperature of 16 K, the magnetisation will be

A particle moves with constant speed v along a regular hexagon ABCDEF in the same order. Then the magnitude of the avergae velocity for its motion form A to