Chapter 21 potential 第八章静电场 3. Electric Potential(P503): The physical quantity to represent property of field at any point - electric potential. A Electric potential at point a is the potential energy per unit charge. =0点 A E·dl AChapter 21 potential 第八章静电场 The physical quantity to represent property of field at any point —— electric potential. 3. Electric Potential (P503): q U V A A  Electric potential at point a is the potential energy per unit charge. V E l V A A   d 0     点    AB A U q E l    0 d