电势能与电势的比较代正负吗？ 电势能电势电场强度大小的比较要带正负号吗是不是只
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-10J小于-5J -10V小于-5v
负的场源电荷激发出的电场中取无穷远电势=0
电势Φ=-kQ/r 都是负值
电势能正负代表增加和消耗，比较时看绝对值。电势正负是大小，比较时带正负。
负的场源电荷激发出....................因为默认了无穷远出为零电势面。
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