大学物理教材中,高斯定理是静电场部分教学的重点和难点。很多问题在求解的过程中,学生往往对问题理解不到位,无从下手。本文通过一道静电场问题的求解,运用高斯定理,对比精确解法与近似解法的差异,强调近似处理的方法,对学生物理思维的训练和提高有所帮助。 University physics teaching, Gauss theorem is the electrostatic field part of the teaching of the key and difficult. Many problems in the process of solving, students often understand the problem is not in place, can not start. This article through a solution of electrostatic field problems, the use of Gaussian theorem, the contrast between exact solution and approximate solution of the difference, emphasizing the approximate approach to dealing with students’ training and improvement of physical thinking is helpful.