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| 1. |
Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled? |
| Answer» SOLUTION :(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 ofexternal magnetising field `overset(to) (B)`. That is why such a sample SHOWS more MAGNETISATION with the same magnetising field. | |