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所在平台: Udemy |
课程主页: https://www.udemy.com/course/electromagnetic-induction-m/
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# 电磁感应课程总结 本课程深入探讨了法拉第在1831年通过实验观察到的电磁感应现象。课程首先从法拉第的两次关键实验出发，引申出电磁感应的产生——由于导体或线圈中磁通量的变化而产生感应电动势。 随后，课程详细介绍了指导电磁感应现象的定律，包括法拉第电磁感应定律、纽曼定律以及楞次定律。 接着，课程探讨了电磁感应在单线圈和双线圈系统中的表现，即自感和互感。自感作为线圈的固有属性，与线圈匝数的平方成正比。在此基础上，课程讨论了两个线圈串联和并联时的等效自感，指出这种等效自感不仅取决于单个线圈的自感，还与它们之间的互感有关。 课程进一步深入研究了两个自感线圈之间的关系，介绍了耦合常数（或称娜塔戈常数），并解释了其取值范围（通常小于1，理想耦合时等于1）。 此外，课程还讲解了动生电动势的产生原理以及法拉第圆盘的原理。 最后，课程通过一项重要的证明——互易定理，验证了两个线圈互感值的唯一性，并对该定理进行了深入的讨论。 **关键词：** 电磁感应、法拉第定律、纽曼定律、楞次定律、自感、互感、耦合常数、动生电动势、互易定理
The event electromagnetic induction is first observed by Michel Faraday by his two experimental observations. From these two observations he concluded for the occurrence induced e.m.f due to the change of magnetic flux linked with a conductor or coil. This conclusion is then guided the laws of electromagnetic induction which are Faraday's law, Neumann's law and Lenz's law. After that the effect of such electromagnetic induction is observed in a single coil which is called self induction and in presence of two coils which is called mutual induction. These two induction effect respectively gives the self and mutual inductances where this self inductance is a characteristics of a coil. This self inductance of a single coil is basically proportional to the square of the number of turns of that coil. After that the discussion over this content is made on the series and parallel combination of two coils. These gives the appearance of equivalent self inductance of the combination which depends not only the individual self inductances but also the mutual inductance of the two coils in the combination. Here the discussion on this content is then made continued to the relation of two self inductances of two coils and in that case the coupling constant or Nagaoga constant which is in general less than one and for ideal coupling, it is equal to one. The discussion of the principle of occurrence of motional e.m.f and principle of Faraday's disc is made continued. The most important assignment which is known as Reciprocity Theorem actually confirms the uniqueness of Mutual inductance of two coils and the discussion over it is also made in this content.
