Magnetic Fields and Circuits. & Magnetic Materials

Chapter 4 Magnetic Fields and Circuits.

Fundamental Electrical and Electronic Principles Third Edition Book
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Summary of Contents

Fundamental Electrical and Electronic Principles Third Edition Book

  • Magnetic Fields and Circuits Chapter 4 Learning Outcomes This chapter introduces the concepts and laws associated with magnetic fi elds and their application to magnetic circuits and materials. On completion of this chapter you should be able to: 1 Describe the forces of attraction and repulsion between magnetised bodies. 2 Understand the various magnetic properties and quantities, and use them to solve simple series magnetic circuit problems. 3 Appreciate the effect of magnetic hysteresis, and the properties of different types of magnetic material. 111 4.1 Magnetic Materials All materials may be broadly classifi ed as being in one of two groups. They may be magnetic or non-magnetic, depending upon the degree to which they exhibit magnetic effects. The vast majority of materials fall into the latter group, which may be further classifi ed into dia-magnetic and paramagnetic materials. The magnetic properties of these materials are very slight, and extremely diffi cult even to detect. Thus, for practical purposes, we can say that they are totally non-magnetic. The magnetic materials (based on iron, cobalt and ferrites) are the ferromagnetic materials, all of which exhibit very strong magnetic effects. It is with these materials that we will be principally concerned. 4.2 Magnetic Fields Magnetic fi elds are produced by permanent magnets and by electric current fl owing through a conductor. Like the electric fi eld, a magnetic fi eld may be considered as being the medium by which forces are