组合场是指电场与磁场同时存在,但各位于一定区域内并不重叠的情况。带电粒子在组合场中的运动一直是高考重点,其运动轨迹变换多端,如锥形瓶形状、花瓣形状、跑道形状。带电粒子在电场中一般做匀变速直线运动或类平抛运动,在磁场中一般做匀速圆周运动。解决此类问题的关键是正确描述带电粒子运动轨迹,求解带电粒子在每个场中 Combinatorial field refers to the electric field and the magnetic field exist at the same time, but each is located in a certain area and does not overlap. The movement of the charged particles in the combined field has always been the focus of the college entrance examination, and its trajectory is varied, such as the shape of a conical flask, the shape of a petal, and the shape of a racetrack. Charged particles in the electric field generally do uniform variable speed linear motion or flat throwing motion in the magnetic field generally do uniform circular motion. The key to solving this kind of problem is to correctly describe the trajectory of charged particles and to solve the problem of charged particles in each field