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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绛旓細鐢佃嵎鍦ㄧ數鍦轰腑绉诲姩鏃,鐢靛満鍔涜鍋氬姛,鎵浠ョ數鑽峰湪鐢靛満涓叿鏈夎兘閲,杩欎釜鑳介噺灏卞彨鐢靛娍鑳.鐢靛娍鑳=鐢佃嵎閲*鐢靛娍 鐢靛娍鑳芥槸鎸囧湪鐢靛満涓换涓ょ偣闂寸Щ鍔ㄧ數鑽凤紝鐢佃嵎鎵鍙楃數鍦哄姏浣滅殑鍔熴傜數鍔挎槸鎸囩數鍦轰腑浠讳袱鐐归棿瀵圭數鑽蜂綔鍔熺殑鏈銆傜浉褰撲簬鍔涘涓殑閲嶅姏鍔匡紝
