空间存在竖直向下的匀强电场和水平方向(垂直纸面向里)的匀强磁

空间存在竖直向下的匀强电场和水平方向(垂直纸面向里)的匀强磁场,如图所示,已知一离子在电场力和洛仑兹力共同作用下,从静止开始自A点沿曲线ACB运动,到达B点时速度为零,C为运动的最低点.不计重力,则                             

A.该离子带负电  B.A、B两点位于同一高度 

C.C点时离子速度最大  D.离子到达B点后,将沿原曲线返回A点 

答案

BC

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