题目

如图所示，在空间存在着水平方向的匀强磁场和竖直方向的匀强电场。电场强度为E，磁感应强度为B，在某点由静止释放一个带电液滴它运动到最低点处，恰与一个原来处于静止的液滴b相撞。撞后两液滴合为一体，沿水平方向做直线运动。已知液滴a质量是液滴b质量的2倍，液滴a所带电荷量是液滴b所带电荷量的4倍。求两液滴初始位置之间的高度差h。（设a、b之间的静电力可以不计）假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。 增加：在缺词处加一个漏字符号 (∧) ，并在其下面写出该加的词。 删除：把多余的词用斜线 ( \ ) 划掉。 修改：在错的词下划一横线，并在该词下面写出修改后的词。 注意：1. 每处错误及其修改均仅限一词。 2. 只允许修改10处，多者 (从第11处起) 不计分。 Water is very important to us, without that there would be no life. We couldn’t live if we didn’t have water. Therefore, some people don’t turn the tap off at once after using it. Some people don’t realize they wash them in the shower too long. Some even throw away bottles full in water. As middle school students, we should make great efforts to save water. On one hand, every single person’s save water is significance. On other hand, we can use some water we just used to watering plants. We shouldn’t leave the tap running for while we brush our tooth.