等势面是静电学中一个重要物理模型 ,抓住等势面的特征 ,灵活应用等势面的特性 ,是准确解答高考中电学新颖题的重要法宝。1　抓住等势面与电场线垂直的特征、判定场强方向例 1　图 1中A、B、C三点都在匀强电场中 ,已知AC⊥BC ,∠ABC =60°,BC =2 0cm ,把一个电量 q=1 0 - 5C的 The equipotential surface is an important physical model in electrostatics. Grasping the features of the equipotential surface and flexibly applying the equipotential surface characteristics is an important magic weapon for accurately answering the new problems in the college entrance examination. 1 Grasp the characteristics of the equipotential surface perpendicular to the electric field line and determine the direction of the field strength. Example 1 In Figure 1, A, B, and C are all in a uniform electric field. Known AC ⊥ BC, ∠ ABC = 60°, BC = 2 0cm, put a power q=1 0 - 5C