Figure 32-25 represents three rectangular samples of a ferromagnetic material in

Question

Figure 32-25 represents three rectangular samples of a ferromagnetic material in which the magnetic dipoles of the domains have been directed out of the page (encircled dot) by avery strong applied field B0. In each sample, an island domain still has its magnetic field directed into the page (encircled x). Sample 1 is one (pure) crystal. The other samples contain impuritties collected along lines; domains cannot easliy spread across such lines. The applied field is now to be reversed and its magnitude kept moderate. The change causes the island domain to grow. (a) Rank the three samples according to the succcess of that growth, greatest first. Ferromagnetic materials in which the magnetic dipoles are easily changes are said to be magnetically soft; when the changes are difficult, requiring strong applied fields, the materials are said to be magnetically hard. (b) Of the three samples, which is the most magnetically hard?

Explanation / Answer

a) 1> 3> 2

b) 2 is the most magnetically hard.

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