Chapter 20 Gauss s law 第八章静电场 ◆点电荷在任意封闭曲面内 (with irregular surface) The same number of field lines pass through suria cse as pass through the spherical surface s pE·dS=中E.dSsgChapter 20 Gauss’s Law 第八章静电场 + 点电荷在任意封闭曲面内 (with irregular surface) 1 S 2 S The same number of field lines pass through s u r f a c e , a s p a s s through the spherical surface . S1 S2 0 2 1 d d  q E S E S S S          