Chapter 21 potential 第八章静电场 2) Circulation theorem:静电场的环路定理 在静电场中,电场强度沿闭合路径的线积分等于零。或 电场力移动单位电荷沿闭合路径一周所做的功为0。 The line integral of the electrostatic field around a closed loop is zero qE·d=qo「E·dl B AlB A2 B q(∫Ed+∫E·d)=0 2 alB B2A Edl=oChapter 21 potential 第八章静电场 2) Circulation theorem: 静电场的环路定理 0。 The line integral of the electrostatic field around a closed loop is zero. E       A B A B q E l q E l 2 0 1 0 d d     ( d d ) 0 1 2 0       A B B A q E l E l      d  0 l E l   1 2 A B