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It is known from Curie's law that magn...

It is known from Curie's law that magnetic moment (m) of a paramagnetic sample is directly proporational to the ratio of the external magnetic field (B) to the absolute temperature (T). A sample of paramagnetic salt contains `2.0 xx 10^(24)` atomic dipoles each of dipole moment `1.5xx 10^(-23) JT^(-1)`.
Sample is placed under a homogeneous magnetic field of `0.84 T` and cooled to a temperature of 4.2. The drgree of magnetic saturation achevied is equal to `15%` . You may assume that `85%` dipoles are randomly oriented and do not contributes to the magnetisation . The total diploe moment of the sample , for a magnetic field of `0.98T` and a temperature of `2.8 K`, is

A

`4.5 J//T`

B

`30 J//T`

C

`7.9 J//T`

D

`3 J//T`

Text Solution

Verified by Experts

The correct Answer is:
C
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