Q16 of 44 Page 202

Answer the following question:

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

At high temperatures, due to the random thermal motion of molecules in a paramagnetic sample, the alignments of dipoles get disrupted. On reducing the temperature random thermal motion reduces, thus disruption is reduced. Hence, a paramagnetic sample displays greater magnetization when cooled.


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14

If the bar magnet in exercise 5.13 is turned around by 180°, where will the new null points be located?

 15

A short bar magnet of magnetic moment 5.25 × 10–2 J T–1 is placed with its axis perpendicular to the earth’s field direction. At what distance from the centre of the magnet, the resultant field is inclined at 45° with earth’s field on (a) its normal bisector and (b) its axis. Magnitude of the earth’s field at the place is given to be 0.42 G. Ignore the length of the magnet in comparison to the distances involved.

 16

Answer the following question:

Why is diamagnetism, in contrast, almost independent of temperature?

 16

Answer the following question:

If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty?