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Why does a paramagnetic sample display g...

Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled?

Text Solution

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(a) When any paramagnetic sample is cooled down, average kinetic energy of thermal vibrations of atomic dipoles decreases. As a result, angle between `overset(to) (m)and overset(to)(B)` decreases. In other words, atomic dipoles tend to be aligned more and more in the direction of external magnetising field `overset(to) (B)`. That is why such a sample shows more magnetisation with the same magnetising field.
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Knowledge Check

  • A paramagnetic sample shows a new magnetisation of 8 "Am"^(-1) when placed in and external magnetic field of 0.6 T at a temperature of 4 K. When the same sample is placed in an external magnetic field of 0.2 T at temperature of 16 K, the magnetisation will be

    A
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    B
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