Saved Bookmarks
| 1. |
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 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 ferreomgnet at every point . (This fact is analogous to the static electric field lines being normal to the surface of conductor at every point). Why ? f. Would the maximum possible magnetisation of paramagnetic sample be of the same order of magnitude as the magnetisation of ferromagnet ? |
|
Answer» Solution :a. The susceptibility X increases. b. The induced magnetic moment of electrons oppose the external field. c. Bismuth being DIAMAGNETIC , field will be SLIGHTLY less than the field in its absence. d. No. it is greater for lower fields. e. `MU` for ferromagnetic is very largc. The lines of FORCE on the surface area and by repulsion take normal shape. f. Yes. But only under extremely high magnetising field . |
|