07年高考卷中几乎每套试卷中都有电场的试题,体现了对电场重点知识的考查,现在笔者对此进行归类分析,给08年高考提供一点借鉴.1在限制条件下带电粒子的运动带电粒子(小球)穿在绝缘杆上或在支持面上运动,由于受到了杆(支持面)的限制,只能沿杆(支持面)运动,其特点是合外力沿杆(支 In 2007, almost every test paper in the college entrance examination paper has electric field test questions, which embodies the examination of the key knowledge of the electric field. Now the author categorizes it and provides some reference for the college entrance examination in 2008.1 The charged particles in limited conditions The charged particles (globules) move on the insulating rod or move on the supporting surface. Due to the limitation of the rod (support surface), they can only move along the rod (support surface). The characteristics are that the external force along the rod (support