物理学中有许多的模型,掌握这些模型对我们解决实际问题,提高创新能力大有裨益.本文希望通过对电磁学中两个模型的分析,能使学生们对用模型法解决物理问题有进一步的认识.1　流体模型在“稳恒电流”一章中,我们学习了导体中电流微观表达式的推导方法:一段粗细均匀的导体,两端加 There are many models in physics. Mastering these models is of great benefit to us in solving practical problems and improving the ability to innovate. This paper hopes that through the analysis of two models of electromagnetics, students can further solve the physical problems with the model method. Cognition .1 Fluid Model In the chapter “Constant Current”, we learned the method of deriving the microscopic expression of current in a conductor: