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带电粒子在电、磁场中的运动问题,是高考中的热点.本文就江苏高考题中带电粒子在电、磁场中由于运动轨迹的空间周期性形成的多解问题进行简要地分析.例1(2014年江苏高考题)某装置用磁场控制带电粒子的运动,工作原理如图1所示.装置的长为L,上下两个相同的矩形区域内存在匀强磁场,磁感应强度大小均为B、方向与纸面垂直且相反,两磁场的间距为d.装置右端有一收集板,M、N、P为板上的三点,M位于轴
The movement of charged particles in electric and magnetic fields is a hot spot in the college entrance examination.This paper briefly analyzes the multi-solution problems of charged particles in electric and magnetic fields due to the spatial periodicity of motion trajectories.Example 1 ( 2014 Jiangsu college entrance examination) a device to control the movement of charged particles with a magnetic field, the working principle shown in Figure 1. Device length L, the upper and lower two identical rectangular regions exist uniform magnetic field, the magnetic flux density are B, The direction perpendicular to the plane of paper and the opposite, the distance between the two magnetic fields d. The device has a collection plate at the right end, M, N, P for three points on the board, M is located on the axis