Ferromagnetic Substances

(a) Give two differences between ferromagnetic and anti-ferromagnetic substances. (b) Tungsten crystallizes in body centred cubic lattice. Calculate the number of unit cells in 1.5 g of tungsten. (At mass of tungsten = 184 u)

With the help of electron spins, clearly distinguish between Ferromagnetic, Antiferromagnetic and Ferrimagnetic substances.

Distinguish between the magnetic properties of dia, para and ferromagnetic substances in terms of (i) susceptibility (ii) magnetic permeability and (iii) Coercivity. Give one example of each of these materials. Draw the field lines due to an external magnetic field near a (i) diamagnetic (ii) paramagnetic substance.

Magnetic permeability of ferromagnetic substance is

Which one is ferromagnetic substance ?

Susceptibility of ferromagnetic substance is