一、问题的提出试题如下:如图1所示,无限大均匀带正电薄板竖直放置,其周围空间的电场可认为是匀强电场。光滑绝缘细管垂直穿过板中间小孔,一个视为质点的带负电小球在细管内运动。以小孔为原点建立x轴,规定x轴正方向为加速度a和速度v的正方向,下图分别表示x轴上各点的电势(?),小球的加速度 First, the questions raised Questions are as follows: As shown in Figure 1, infinite uniform positive charged sheet placed vertically, the electric field around the space can be considered uniform strong electric field. Smooth insulated thin tube vertically through the middle of small holes in the plate, as a negative particle as a small ball in the thin tube movement. The small hole as the origin of the establishment of the x-axis, the positive direction of the x-axis for the acceleration a and v of the positive direction, the following figure shows the x-axis potential at each point (?), The ball acceleration