1.

The magnetic susceptibility of a paramagnetic substance at -73^(@) is 0.0050. Calculate magnetic susceptibility at -173^(@)C.

Answer»

`0.010`
`0.0025`
`0.0020`
`0.0030`

Solution :ACCORDING to Curie.s law, `chi_(m) = (mu_(0) C)/( T) , mu_(0) C` is constant
`therefore chi_(m) prop (1)/(T)`.
`therefore (chi_(m_(2) ) )/( chi_(m_(1) ) )= (T_1)/( T_2)`
`therefore (chi_(m_2) ) /( 0.005) = (273 - 73)/( 273-173) = (200)/( 100)`
`therefore chi_(m_2) = 2 xx 0.005 therefore chi_(m_2) = 0.010`


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