Q. 15.0( 4 Votes )

A paramagnetic material is placed in a magnetic field. Consider the following statements:

(A) If the magnetic field is increased, the magnetization is increased.

(B) If the temperature is increased, the magnetization is increased.

A. Both A and B are true

B. A is truer but B is false

C. B is true but A is false

D. Both A and B are false

Answer :

When a paramagnetic material is placed in a magnetic field its atomic dipoles align in a direction parallel to applied magnetic field and the material produces an extra magnetic field in the direction of applied electric field


On increasing the magnetic field the magnetic moment increases in the same direction.


Magnetization or intensity of magnetization is given by formula



Where


M=magnetic moment


V=volume


So, on increasing the magnetic moment magnetization increases


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



Where


C =constant called curie constant


T=temperature


Also magnetization is given by



Where χ =susceptibility


H=magnetic intensity


Therefore, on increasing temperature, susceptibility decreases, magnetization increases


Therefore, when a paramagnetic material is placed in a magnetic field, on increasing magnetic field, magnetization increases and on increasing temperature, magnetization decreases

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