贵刊2003年第4期和《中学物理教学参考》2003年第3期发表了同一篇题为《“变化的电场产生磁场”的演示实验设计》的文章[1],并受到关注、得到改良[2].但是,不论改良与否,这类演示实验在原理上都是错误的.为了便于讨论,先简要介绍这两篇文章的做法.图1文献[1]的做法是:用导线将 In the 4th issue of “Chinese Journal of Physics Teaching Reference” (2003) and 3rd edition of “Physical Education in Middle School Reference”, published the same article [1] titled “Demonstrative Experimental Design of Changing Electric Field to Produce Magnetic Field”, and received attention and improved. [2]. However, this type of demonstration experiment is wrong in principle whether it is improved or not. For ease of discussion, first briefly introduce the practice of these two articles. Figure 1 The practice of [1] is to use wire