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Draw the vari...

Question

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

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A well labelled graph has been drawn.

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Q. A magnetising field intensity of

1000 \frac{A}{m}

produces magnetic flux density

0.25 \frac{W b}{m^{2}}

in a ferromagnetic substance. The relative permeability of ferromagnetic substance is )(Approximately)

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. Distinguish between diamagnetic and ferromagnetic substances in respect of (i) Intensity of Magnetisation, (ii) behaviour in a non-uniform magnetic field and (iii) suspectibility.

Q. For a magnetic material graph between intensity of magnetisation

(\to I)

and magnetic intensity

(\to H)

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Then material is

Q. Which of the following pairs has quantities of the same dimensions?
(a) Magnetic field B and magnetising field intensity H
(b) Magnetic field B and intensity of magnetisation I
(c) Magnetising field intensity H and intensity of magnetisation I
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Standard XII Physics