物理学 5-8电场强度与电势梯度 第五版 电场强度与电势梯度 (Electric field intensity &e electric potential gradient) 1AB=-(VB-)=E△=E△ l cose ECOSO=Er ,B4Z △ △=E△,E1 △Z =-lim△ E +△ △→>0△l al 电场中某二点电场强度没某,方向的分量,等于 该点电势沿该方向单位长度上电势变化率的负值 At some point in the electric field the component of electric field intensity along some direction is equal the negative rate of change of electric potential perunit leng th along that direction at that point nti 第五章静电场 7/24第五章 静电场 物理学 第五版 5-8 电场强度与电势梯度 7/24 二电场强度与电势梯度 (Electric field intensity & electric potential gradient) cos U V V E l E l AB B A = − − =  =  （ ）  E  = El cos V V + V l   E   A B l V V El l El   −  =  ， = − 0 l lim l V V E l l  →   = − = −   电场中某一点电场强度沿某一方向的分量，等于 该点电势沿该方向单位长度上电势变化率的负值. At some point in the electric field the component of electric field intensity along some direction is equal to the negative rate of change of electric potential per unit length along that direction at that point El