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来源：学生作业帮编辑：大师作文网作业帮分类：物理作业时间：2024/11/11 13:35:37

第八题请老师写出详细的解答步骤

解题思路：此为速度选择器模型
解题过程：
解析：此为速度选择器模型。因负离子受到电场力方向向下，故洛伦兹力方向向上，由左手定则判定出磁场方向为点磁场，即垂直纸面向外。大小为：Eq=qVB B=E/V
最终答案：略

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