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The magnetic susceptibility of a paramag...

The magnetic susceptibility of a paramagnetic material at `-73^(@)C "is" 0.0075`, its value at `-173^(@)C` will be

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Magnetic susceptiblity,
`" " chi_(1)=0.0075, T_(1)=-73^(@)C=(-73+273)K=200K`
`" " chi_(2)=?, T_(1)=-173^(@)C=(-173+273)K=100K`
According to Curie's Law, `chi_(m)alpha(1)/(T)`
Ratio of magnetic susceptibility, `(chi_(m_(1)))/(chi_(m_(2)))=(T_(1))/(T_(2))=(200)/(100)=2`
`Rightarrow " " chi_(m_(2))=2chi_(m_(1))=2xx0.0075=0.015`
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