物理学 5-4电场强度通量高斯定理 第五版 电场线( Electric field lines 规定( The regulations) 1)曲线上每一点切线方向 为该点电场方向 The tangent at any point on the curve is in the direction of the electric field vector at that point dN 2)通过垂直于电场方向单位面积|E=E 电场线数为该点电场强度的大小 ds The electric field lines per unit area through perpendicular to the direction of the electric field is equal to the size of the electric field intensity at that point 第五章静电场 1/45第五章 静电场 物理学 第五版 5-4 电场强度通量 高斯定理 1/45 一 电场线(Electric field lines) 1)曲线上每一点切线方向 为该点电场方向 d d N E E S = = 规定(The regulations) E  S 2)通过垂直于电场方向单位面积 电场线数为该点电场强度的大小 The tangent at any point on the curve is in the direction of the electric field vector at that point The electric field lines per unit area through perpendicular to the direction of the electric field is equal to the size of the electric field intensity at that point