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A paramagnetic sample shows a net magnet...

A paramagnetic sample shows a net magnetisationo f 6 A/m when it is placed in an external magnetic field of 0.4 T at a temperature of 4 K. When the sample is placed in an external magnetic field of 0.3 T at a temperature of 24 K, then the magnetisation will be :

A

1 A/m

B

4 A/m

C

2.25 A/m

D

0.75 A/m

Text Solution

Verified by Experts

The correct Answer is:
D
For paramagnetic material according to Curie.s law
`chi prop 1/T`
`chi prop 1/T rArr chi_(1)T_(1)=chi_(2)T_(2)`
`rArr 6/(0.4) xx 4 =I/(0.3) xx 24`
`I = (0.3)/(0.4) = 0.75` A/m .
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