································································· 2分
（2）微粒作匀速圆周运动的半径为
··········································································· 2分
由几何关系得：································································· 2分
圆心角·················································································· 2分
···················································································· 2分
····························································· 2分
微粒从A到，竖直方向匀减速，水平方向匀加速
竖直方向：            ············································ 2分
水平方向：························································· 2分
（3）匀速圆周运动的周期
·············································································· 2分
·········································································· 2分
（其他正确解法同样得分）

◎ 知识点

    专家分析，试题“如图所示,竖直放置的、两平行板间存在着水平向右的匀强电场，、间的距离为，板上有一水平小孔正对右侧竖直屏上的点，以为坐标原点建立坐标系轴水平、轴竖直)。板与屏之间距离…”主要考查了你对  【带电粒子在复合场中的运动】  等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。