在处理关于φ-x图象的问题时,不少教师对电场强度与电势梯度的关系认识不够准确,组织教学不能做到深入浅出。本文从一道高考题挖掘教学资源,有效组织教学使中学生更容易理解φ-x图象中关于电场强度和电势梯度的信息。1.一道有争议的高考题及对其作出的理论分析。(2004年上海卷)某静电场沿x方向的电势分布如图1所示,则() In dealing with the problem of φ-x images, many teachers do not understand the relationship between the electric field strength and the potential gradient accurately, and the teaching of the organization can not be explained in simple terms. This article excavates teaching resources from a college entrance examination, effectively organize teaching to make it easier for middle school students to understand the information about the electric field intensity and potential gradient in φ-x images. A controversial college entrance examination questions and theoretical analysis. (Shanghai Volume 2004) A static electric field along the x-direction potential distribution shown in Figure 1, ()