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Review of basic magnetostatics

Review of basic magnetostatics
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Before we can begin our discussion of magnetic materials we need to understand some of the basic concepts of magnetism, such as what causes magnetic fields, and what effects magnetic fields have on their surroundings. These fundamental issues are the subject of this first chapter. Unfortunately, we are going to immediately run into a complication. There are two complementary ways of developing the theory and definitions of magnetism. The ��physicist��s way�� is in terms of circulating currents, and the ��engineer��s way�� is in terms of magnetic poles (such as we find at the ends of a bar magnet). The two developments lead to different views of which interactions are more fundamental, to slightly different-looking equations, and (to really confuse things) to two different sets of units. Most books that you��ll read choose one convention or the other and stick with it. Instead, throughout this book we are going to follow what happens in ��real life�� (or at least at scientific conferences on magnetism) and use whichever convention is most appropriate to the particular problem.We��ll see that it makes most sense to use Syst`eme International d��Unit´es (SI) units when we talk in terms of circulating currents, and centimeter�Cgram�Csecond (cgs) units for describing interactions between magnetic poles. To avoid total confusion later, we will give our definitions in this chapter and the next from both viewpoints, and provide a conversion chart for units and equations at the end of Chapter 2. Reference provides an excellent light-hearted discussion of the unit systems used in describing magnetism.

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Add:Unit H, 4F Rihua Mansion, No. 8 Xinfeng 2nd road, Torch Hi-Tech Zone, Xiamen, China.

Tel:0086-592-5781916

Fax:0086-592-5123653

E-mail:info@china-magnet.net

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