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Electromagnetism is an important subject in physics, especially for the students majoring in science and technology. It is, however, much more difficult than Mechanics. One of the reasons is that ther...e are several concepts in Electromagnetism which have not appeared in Mechanics. To make matters worse, there are confusions even in the textbooks. In this paper, we concentrate on the concept of “electromotive force” (emf) as one of such examples and point out the confusions in the literature on the basis of the proper treatment. In conclusion, we point out that it is possible to make a clear explanation about emf at the elementary level.show more
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