电场中“线球”模型在高考试题中频繁出现.此类试题能综合考查学生应用力学知识解决问题的能力.由于线只能产生拉力不能产生支持力,所以这类问题往往需要讨论临界状态,因此难度较大.下面按”线球”模型运动形式的不同进行分类解析,供读者参考.类型1:电场中“线球”模型的平衡在 The “wireball” model in the electric field frequently appears in the high test questions. Such questions can comprehensively examine the students’ ability to apply the knowledge of mechanics to solve problems. Since the line can only generate pulling force and cannot produce support, such problems often need to discuss the critical state. Therefore, it is more difficult. According to the different forms of the “ballball” model, the classification analysis is provided for readers’ reference. Type 1: Balance of the “wireball” model in the electric field