1. (1) Write short notes on the following: Diamagnetism; Paramagnetism; Ferromagnetism ; Antiferromagnetism (ii) Give two examples of material exhibiting each of the
1. (1) Write short notes on the following: Diamagnetism; Paramagnetism; Ferromagnetism ; Antiferromagnetism (ii) Give two examples of material exhibiting each of the
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TUTORIAL 7.
1. (i) Write short notes on the following:
Diamagnetism; Paramagnetism; Ferromagnetism;
Antiferromagnetism
(ii)
Give two examples of material exhibiting each of the
2. The research literature on magnetism is to a great extent still based
on cgs (emu) system of units in which B is measured in gaus and H in
oersteds, although these two units differ only in name. To get a feel
for the cgs and Sl units in magnetism, calculate: (a) the magnetization
per unit volume and per unit mass in both cgs and SI systems for Fe,
Co and Ni at 0 K given that the atomic moments are 2.22 , 1.72 ,
and 0.61 ,, respectively; (b) the ratio of the Curie constants per mole
in the two systems for any given substance.
SI
cgs
0.9273x104 ergG
1.381x1016 ergK
-20
0.9273x1028 JT
1.381x1023 JK'
4Ttx107 Hm1
1
3. The a phase of iron above the Curie temperature has a paramagnetic
susceptibility satisfying K = c/(T - T.) where C=2.18 K and
T. = 1093 K. Estimate the Weiss molecular field in iron at 0 K.
4.
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