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A paramagnetic sample shows a net magnet...

A paramagnetic sample shows a net magnetisation of `8A.m^(-1)` when placed in an external magnetic field of 0 .6T at a temperature of 4 K . When the same sample is placed in an external magnetic field of 0.2T at a temperature of 16 K , the magnetisation would be

A

`(32)/(3)A.m^(-1)`

B

`(2)/(3)A.m^(-1)`

C

`6A.m^(-1)`

D

`2.4A.m^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`because Iprop(B)/(T)therefore(I_(2))/(I_(1))=(B_(2))/(B_(1))xx(T_(1))/(T_(2))`
`therefore I_(2)=I_(1)xx(B_(2))/(B_(1))xx(T_(1))/(T_(2))=8xx(0.2)/(0.6)xx(4)/(16)=(2)/(3)A.m^(-1)`
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