2012年北京高考理综物理试题的压轴题,可谓是一道考查物理思想方法的好题.原题如下:题目匀强电场的方向沿x轴正向,电场强度E随x的分布如图1所示.图中E_0和d均为已知量.将带正电的质点A在O点由静止释放,A离开电场足够远后,再将另一带正电的质点B放在O点 2012 Beijing college entrance exam physics test questions of the finale, can be described as a good way to examine the physical thinking method. The original title is as follows: Title uniform electric field direction along the x-axis forward, the distribution of electric field strength E with x shown in Figure 1 Shown in Figure E_0 and d are known quantities will be positively charged particle A by the static release at point O, A far enough away from the electric field, and then another positive particle B at the point O