Exercise 2
Question 26
Explain the following with suitable examples:
(i) Ferromagnetism
(ii)Paramagnetism
(iii)Ferrimagnetism
(iv)Antiferromagnetism
(v)12-16 and 13-15 group compounds.
(a) Ferromagnetism – The substances which are strongly attracted by the magnetic field & show permanent magnetism even when the magnetic field is removed are known as ferromagnetic substances.When there is spontaneous alignment of magnetic moments of domain in the same direction,ferromagnetism happens
(b) Paramagnetism-the substances which have permanent magnetic dipoles & are attracted by the magnetic field are known as paramagnetic substances& the phenomenon is called paramagentism
(c) Ferrimagnetism-when the magnetic moment of domains are aligned in parallel & antiparallel directions in unequal numbers resulting in net magnetic moment,ferrimagnetism happens.
(d) Antiferromagnetism-if the alignment of magnetic moment of domains is in a compensatory way so as to give zero net magnetic moment because of cancellation of the individual magnetic moment,anti ferromagnetism happens
(e)12- 16 & 13-15 group – the solid binary compound prepared by combining elements of group 12 & 16 are called 12-16 compound.the compound prepared by combining elements of group 13 & 15 are called 13-15 compounds.These compounds are used as semiconductor.
