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18/09/2020 6:28 pm
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A paramagnetic sample shows a net magnetisation of 6A/m when it is placed in an external magnetic field of 0.4 T at a temperature of 4K. When the sample is placed in an external magnetic field of 0.3T at a temperature of 24K, then the magnetisation will be :
(1) 4 A/m
(2) 0.75 A/m
(3) 2.25 A/m
(4) 1 A/m
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18/09/2020 6:29 pm
(2) 0.75 A/m
Explanation:
M = CBext/T
Putting the value we get N = 0.25 A/m