中学物理教学中带电粒子在电场、磁场和重力场组成的复合场中的运动规律十分典型,在高考中占有相当重要的地位.那是因为该部分知识是高中许多重要定理、定律、运动模型的载体.换句话说综合性试题出现的几率较大,易于出题,故而我们有必要将本处的每一个知识点弄清理透.不久前在教学过程中,发现这样一道题目,只有清楚情境中带电粒子的运动轨迹,方能易于作出准确判断.具体内容如下: The motion law of charged particles in secondary school physics teaching is very typical in the compound field composed of electric field, magnetic field and gravity field, which occupies a very important position in college entrance examination. That is because this part of knowledge is a number of important theorems, laws, and motion models of high school. Carriers. In other words, comprehensive test questions are more likely to appear, and it is easy to ask questions. Therefore, it is necessary for us to clear up every knowledge point in this department. Not long ago in the teaching process, we discovered such a problem, only in clear situations. The trajectory of charged particles can easily be accurately judged. The details are as follows: