The susceptibility of magnesium at 300 K is 1.2 × 10–5. At what temperature will the susceptibility increase to 1.8 × 10–5?
Given:
Temperature T1=300K
Temperature T2=?
Susceptibility at temperature T1
Susceptibility at temperature T2, 
We know that
According to Curie’s law at far away from saturation susceptibility χ of paramagnetic material is inversely proportional to temperature (T)
Where,
C=curie’s constant
T=temperature
We can say that
Putting the values of χ1, χ2 and T1 we get
Therefore, susceptibility will increase to at temperature 200K
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