题目

如图所示，在方向水平向右的匀强电场中（图中未画出），有一固定光滑绝缘的半球形碗，碗的半径为R．有一个质量为m、电荷量为+q的小球，静止在距碗底高度为 的碗内右侧表面上． （1） 求匀强电场的电场强度的大小； （2） 若将匀强电场方向变为竖直向下，求小球运动到碗底时对碗的压力大小． So seriously        that he had to stop playing in the football match. [　　] A．  his feet were hurt B．  were hurt his feet C． hurt were his feet D．  were his feet hurt