Q. 25.0( 2 Votes )

A paramagnetic material is kept in a magnetic field. The field is increased till the magnetization becomes constant. If the temperature is now decreased, the magnetization.
A. will increase

B. decrease

C. remain constant

D. may increase or decrease

Answer :

We know that


Curies law states that susceptibility of a paramagnetic substance is inversely proportional to its absolute temperature



Where


C =constant called curie constant


T=temperature


This law holds only when material is far away from saturation(i.e. magnetization has not become constant)


According to question saturation has been achieved and curie’s law doesn’t hold true now (i.e. does not changes with temperature)


Also magnetization is given by



Where


χ =susceptibility


H=magnetic intensity


Since and H remains constant therefore magnetization will also remain constant


Therefore, when a paramagnetic material is placed in a magnetic field and saturation is achieved on decreasing the temperature magnetization remains constant

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