Chapter 21 potential 第八章静电场 1)Work done by electrostatic Force 点电荷的电场 Electric field of a point charge dW=anE·da B ggo 4兀F,d7 B F·dl= rdl cos e=rdr q40 0 4π60Chapter 21 potential 第八章静电场 q 1) Work done by Electrostatic Force 0 q r W q E l d d 0 r l r qq d 4π 3 0 0 r dl rdl cos rdr r r qq W d 4π d 2 0 0 点电荷的电场 Electric field of a point charge l d dr Ar A Br B E