如图所示,一水平固定的小圆盘,带电量为,电势为零,从圆盘中心

如图所示,一水平固定的小圆盘,带电量为,电势为零,从圆盘中心处由静止释放一质量为,带电量为的小球,由于电场的作用,小球竖直上升的高度可达盘中心竖直线上的点,,又知道过竖直线上的点时,小球速度最大,由此可知在所形成的电场中,可以确定的物理量是                                

       A点场强                                            B点场强            

       C点电势                                            D点电势

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