Introduction
Electromagnetics is a brief name for the subject that deals with the theory and applications
of electric and magnetic fields. Its implications are of fundamental importance
in almost all segments of electrical engineering. Limitations on the speed of modern
computers, the range of validity of electrical circuit theory, and the principles of
signal transmission by means of optical fibers are just a few examples of topics for
which knowledge of electromagnetics is indispensable. Electricity and magnetism
also affect practically all aspects of our lives. Probably the most spectacular natural
manifestation of electricity is lightning, but without tiny electrical signals buzzing
through our nervous system we would not be what we are, and without light (an
electromagnetic wave) life on our planet would not be possible.
The purpose of this chapter is to give you a glimpse of what you will learn in
this course and how powerful this knowledge is. You will find that you are familiar
with some of the information. However, you may also find that some concepts or
equations mentioned in this chapter are not easy to understand. Don't let this problem
bother you, because we will explain everything in detail later. What is expected
at this point is that you refresh some of your knowledge, note some relationships,
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