Chapter 20 Gauss s law 第八章静电场 2)The cases that planes are in the uniform e but the area s in not perpendicular to e The number of electric field line through both area ofs and s are equal, so ◆均匀电场,E与平面夹角O ①= ES COS 6 Φe=E·S EChapter 20 Gauss’s Law 第八章静电场 2) The cases that planes are in the uniform but the area S in not perpendicular to E  The number of electric field line through both area of S and are equal, so  S E  S Φe  ES cos  均匀电场 ，E与平面夹角    n e   Φ E S     e E 