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Assertion: A paramagnetic sample display...

Assertion: A paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled.
Reason: The magnetisation does not depend on temperature.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If the assertion and reason both are false.

Text Solution

Verified by Experts

The correct Answer is:
C
A paramagnetic sample displays greater magnetization when cooled, this is because at lower temperature, the tendency to disrupt the alignment of dipoles (due to magnetising field) decreases on account of reduced random thermal motion.
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Answer the following questions: (a) Why does a paramagnetic sample display greater magnetization (for the same magnetizing field) when cooled. (b) Why is diamagnetism, in contrast, almost independent of temperature? (c) 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? (d) Is the permeability of a ferromagnetic material independent of the magnetic field? If not, is it more for lower or higher fields? (e) Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point). Why? (f) Would the maximum possible magnetization of a paramagnetic sample be of the same order of magnitude as the magnetization of a ferromagnet?

A: Paramagnetic sample displays greater magnetisation (for the magnetizing field) when cooled. R: The tendency to disrupt the alignment of dipoles (with the magnetising field) arising from random thermal motion is reduced at lower temperatures.

The ratio of magnetisation I to the magnetic field intensity H is

The ratio of the intensity of the magnetisation to the strength of magnetising field is called

The ratio of magnetic induction (B)to the strength of magnetising field is called

The dimensional formula for magnetising field H is

Why does the magnetisation of a paramagnetic salt increase on cooling?

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