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Independence of waves
K7ITM wrote:
. . . I've seen it written, by a well-respected expert on antennas, that electromagnetic fields may be viewed in either of two different ways. Are there more than two, other than minor variations on the theme? I'm not sure. The two I know from that author are that (1) fields are real physical entities, and (2) that fields are merely mathematical abstractions to help explain our observations: in the case of electromagnetic fields, that acceleration of a electron results in sympathetic motion of free electrons throughout the universe. . . . . . Throughout my time at the USAF technical school, I was frustrated by the hand-waving of the instructors when the topic was electromagnetic fields (and many other topics, for that matter). It was obvious that they really had a very poor grasp of the subject(s). So on the very first day of my first college semester of fields, I asked the professor, "What is an electromagnetic field?" His response: "Electromagnetic fields are mathematical models we use to help us understand phenomena we observe." The professor was Carl T.A. Johnk. I have his textbook _Engineering Electromagnetic Fields and Waves_, which was in draft manuscript form at the time I took the course. The first sentence in section 1-1 on page 1 is "A field is taken to mean a mathematical function of space and time." Roy Lewallen, W7EL |
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