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Magnetisation

A paramagneti...

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A paramagnetism sample shows a net magnetisation of 8A/m when placed in an exeternal magnetic field of .6T at a temp. of 4K .when the sample is placed in an external magnetic field of .2 T at a temp.of 16K the magnetisation will b

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Q. A paramagnetic sample shows a net magnetisation of

8

m^{- 1}

when placed in an 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 a temperature of

16

K, the magnetisation will be.

Q. A paramagnetic sample shows a net magnetisation of

6 A/m

, when it is placed in an external magnetic field of

0.4 T

, at a temperature of

4 K

. When the sample is placed in an external magnetic field of

0.3 T

at a temperature of

24 K

, then the magnetisation will be :

Q. A paramagnetic sample shows a net magnetization of

0.8 A m^{- 1}

, when placed in an external magnetic field of strength

0.8 T

at a temperature

5 K

. When the same sample is placed in an external magnetic field of

0.4 T

at a temperature of

20 K

, the magnetization is:

Q. A paramagnetic substance when placed in an externally applied non-uniform magnetic field tends to ___________.

Q. Answer the following questions:
(a) Why does a paramagnetic sample display greater magnetisation (for the same magnetising 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 magnetisation of a paramagnetic sample be of the same order of magnitude as the magnetisation of a ferromagnet?

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