电势能跟电势……很急 电势能和电势
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正电荷:电势能Ep=电势φ×q
负电荷:电势能Ep=电势φ×(-q),即Ep=-φ×q
可以看出正电荷电势能的正负和电势的正负相同,负电荷的正负和电势的正负相反。
电场线的疏密不一样
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