物理学 5-6静电场的环路症理电势能 第五版 q90 990-dr=0 4πEorA 4丌Enr ◆任意电荷的电场(视为点电荷组) The electric field of any charge( regards as the point charge system E=∑EW=qJEd=∑E=∑乐E 结论:静电场力做功仅与试验电荷始末位置有关, 与路径无关. Conclusion The work done by the electrostatic force only depends on the initial final positions of the test charge &e is independent of the path that it took. 第五章静电场 2/6第五章 静电场 物理学 第五版 5-6 静电场的环路定理 电势能 2/6 0 0 1 1 ( ) 4 π A B qq W  r r = − 结论:静电场力做功仅与试验电荷始末位置有关， 与路径无关. 0 2 0 d 0 4 π qq W r  r = =  Conclusion ：The work done by the electrostatic force only depends on the initial & final positions of the test charge & is independent of the path that it took. 任意电荷的电场(视为点电荷组) The electric field of any charge ( Regards as the point charge system) E E = i  =  l W q E l   d 0 0 d i l =  q E l   0 d i l =  q E l 