11 Figure 32-25 represents three rectangular samples of a ferro- magnetic material in which the magnetic dipoles of the domains have been directed out of the page (encircled dot) by a very strong applied field Bo. In each sample, an island domain still has its mag- netic field directed into the page (encircled x). Sample 1 is one (pure) crystal. The other samples contain impurities collected along lines; domains cannot easily 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 success of that growth, greatest growth first. Ferromagnetic materials in which the mag- netic dipoles are easily changed 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 sam- ples, which is the most magnetically hard? Impurity line 7 (1) (2) (3)

11 Figure 32-25 represents three rectangular samples of a ferro- magnetic material in which the magnetic dipoles of the domains have been directed out of the page (encircled dot) by a very strong applied field Bo. In each sample, an island domain still has its mag- netic field directed into the page (encircled x). Sample 1 is one (pure) crystal. The other samples contain impurities collected along lines; domains cannot easily 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 success of that growth, greatest growth first. Ferromagnetic materials in which the mag- netic dipoles are easily changed 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 sam- ples, which is the most magnetically hard? Impurity line 7 (1) (2) (3)

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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