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Magnetic Flux

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Question

how does the intensity of magnetisation of a paramagnetic material vary with increasing applied magnetic field?

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Solution

It increases directly with increase in applied magnetic field. In other word the intensity of magnetisation of a paramagnetic material is directly proportional to the applied magnetic field.

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Q. A paramagnetic material is kept in a magnetic field. The field is increased till the magnetisation becomes constant. If the temperature is now decreased, the magnetisation
(a) will increase
(b) will decrease
(c) will remain constant
(d) may increase or decrease

Q. Draw the variation of magnetic field (B) with magnetic intensity (H) when a ferromagnetic material is subjected to a cycle of magnetisation.

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?

Q. A paramagnetic material is placed in a magnetic field. Consider the following statements:
(A) If the magnetic field is increased, the magnetisation is increased.
(B) If the temperature is increased, the magnetisation is increased.
(a) A and B are true.
(b) A is true but B is false.
(c) B is true but A is false.
(d) A and B are false.

Q. The magnetic susceptibility of a paramagnetic substance is

3 \times 10^{- 4} A m^{- 1}

. The intensity of magnetisation will be : (

H = 4 \times 10^{3}

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