Question

A paramagnetic sample shows a net magnetisation of 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 

(1) 1 A/m

(2) 0.75 A/m 

(3) 4 A/m 

(4) 2.25 A/m

Answer 1

(2) 0.75 A/m

x = 0.75 A/m