如右图所示,水平放置的两平行金属板间距为 d ,电压大小为U,上

如右图所示,水平放置的两平行金属板间距为 d ,电压大小为U,上板中央有孔,在孔正下方的下板表面上有一个质量为 m、、电量为-q的小颗粒,将小颗粒由静止释放,它将从静止被加速,然后冲出小孔,则它能上升的最大高度 h= ______

 

答案

解析:略

 

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