电磁学02-02：导体电荷分布 口导体表面电荷与法拉第圆桶实验： (a)Solid conductor with charge qc (b)The same conductor with an internal cavity (c)An isolated charge g placed in the cavity +十 + Arbitrary qc +q Gaussian =0 within surface A + Cavity + conductor + + The charge 4c resides entirely on the surface of Because E=0 at all points within the conductor. For Eto be zero at all points on the Gaussian the conductor.The situation is electrostatic.so the electric field at all points on the Gaussian surface,the surface of the cavity must have a E =0 within the conductor. surface must be zero. total charge -g. (a)）Insulating (b) Metal lid () Metal lid thread Charged conducting ball Metal container Insulating stand Once the ball touches the container,it Charged ball induces charges on the is part of the interior surface;all the interior and exterior of the container. charge moves to the container's exterior. 电磁学02-02: 导体电荷分布  导体表面电荷与法拉第圆桶实验：