The susceptibility of a magnesium at 300 K is 1.2×10−5 . The temperature (in K) at which the susceptibility increases to 1.8×10−5 is ---------------
As per Curie's Law , Magnetic susceptibility is given by
χ=cT⇒χ1χ2=T2T1 ⇒1.2X10-51.8X10-5=T2300 ⇒T2=200K