已知一匀强电场中,某一点为零点势能.现有一正电荷在A点的电势能为负值,负电荷在B点的电势能也为负值.在没有其他条件情况下,能否直接比较两点的电势高低?若能,哪一点电势高?若不能,则

问题描述：

已知一匀强电场中,某一点为零点势能.现有一正电荷在A点的电势能为负值,负电荷在B点的电势能也为负值.在没有其他条件情况下,能否直接比较两点的电势高低?若能,哪一点电势高?若不能,则还需添加什么条件?

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最佳答案：

能啊,根据E=qφ,E,q是矢量 φ为标量（φ的正负只代表大小）,算的时候把正负带进去,正电荷E负q正,所以φ负.负电荷E负q负,所以φ为正,所以正电荷电势小于负电荷

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