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We analyzed how two basic electromagnetism textooks approach the concept of electric field. We limited our study to the reasons given in these textbooks for the introduction of the field representation and to how accurate, coherent, and complete these reasons are. Because many times historical reasons are intertwined with textbooks' explanations of physical phenomena, we used the historical evolution of the field representation to guide our analysis. The analysis shows that one textbook mixes up the historical and pedagogical reasons for the introduction of the concept of field. The other one presents a sketch that might lead students to understand the field and the action-at-a-distance views as supplementing each other. 相似文献
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In this work we analyzed how electric and magnetic lines of force were conceived byFaraday and how they are understood by a group of Argentine university studentsafter receiving instruction. Our results show that many students possess ideas similarto those of Faraday in that lines of force are conceived as real physical entities responsible for the transmission of the electric action. These results are in accordance with the interpretation of physical entities as ``matter-based' suggested by Chi et al. (1994). It is suggested that emphasis on the geometrical character of these lines seems imperative in basic electromagnetism classes in order to avoid this kind of confusion. 相似文献
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