Chapter 21 potential 第八章静电场 2. Electric Potential Energy电势能(PS15): Because electrostatic force is a conservative force an electric potential energy U can be introduced: 静电场是保守场,静电场力是保守力静电场力 所做的功就等于电荷电势能增量的负值. A→B AB.edI 如B (UR-U △UChapter 21 potential 第八章静电场 Because electrostatic force is a conservative force, an electric potential energy U can be introduced: 2. Electric Potential Energy 电势能(P515): 静电场是保守场，静电场力是保守力.静电场力 所做的功就等于电荷电势能增量的负值. U U U W q E l B A AB A B          ( ) d 0   E  0 q A B