DEBATABLE TASKS IN THE TRADITIONAL METHOD OF ELECTRODYNAMICS TEACHING

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DEBATABLE TASKS IN THE TRADITIONAL METHOD OF ELECTRODYNAMICS TEACHING

Journal Title: ФІЗИКО-МАТЕМАТИЧНА ОСВІТА - Year 2018, Vol 15, Issue 1

Abstract

The article deals with the theoretical analysis of the traditional approaches to electrodynamics teaching. The author has paid attention to the contradictions arising in the process of application of the classical Biot-Savart`s law and the neutrality conditions of the conductor with a constant current. It is foremost marked that there are different points of view as for the status of Biot-Savart`s law, which is unacceptable during interpretation of the electrodynamic phenomena and at the study of electrodynamics by future physics teachers. Contradictions to principle of relativity, arising at joint application of Biot-Savart and Coulomb`s laws are described and analysed in detail. These contradictions arise as a result of the fact that in the analysis of electromagnetic phenomena the relativistic correction in the expression of the intensity of the electric field of a uniformly mobile charged particle is neglected. Despite of the meagerness of the magnitude of such an amendment, it should be taken into account for the correct and adequate description of the phenomena. Three neutrality conditions of the conductor with a constant current proposed in the scientific and methodological literature are discussed. It is shown that a traditional neutrality condition of the conductor with a constant current , where is charge density of the conduction electrons in the reference system (RS) ; is the drift velocity of the conduction electrons; ; is the speed of light in vacuum; , are the charge densities of the conduction electrons and positive ions, respectively, in their own reference systems, is inconsistent and contradicts to principle of relativity. The noncontradictory neutrality condition of the conductor with a constant current is offered. The conclusion about some limited nature of traditional teaching methods of electrodynamics is drawn. Biot-Savart`s law and the formula (which is obviously a consequence of Coulomb's law) are not compatible for simultaneous use in the analysis of the same electrodynamic problem because they lead to principally false conclusions and contradictions. At the same time in standard textbooks and scientific and methodological publications these two formulas are used together, which is, from our point of view, the physical error.

Authors and Affiliations

O. Konoval

Keywords

Biot-Savart`s law. neutrality condition of the conductor with a constant current. teaching methods of electrodynamics. principle of relativity

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EP ID EP475256
DOI 10.31110/2413-1571-2018-015-1-019
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