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所谓电场中的“三线”指的是带电粒子的运动轨迹、电场线和等势线(面),高考对电场部分的考查通常都要通过这“三线”来呈现,这部分问题综合性较强,涉及到带电粒子的电性、受力、运动、做功与能量变化等问题,更成为高考考查知识、能力的落脚点,所以理清“三线”问题是电场复习的关键.下面把该类问题归类,给出其特点,各个击破.一、电场线与轨迹线带电粒子轨迹线与电场线不一定重合,电场线是为了形象描述电场而引入的假想几何线,实际上
The so-called “three-wire” in the electric field refers to the trajectories of the charged particles, the electric field lines and the equipotential lines (surface). The examination of the electric field part of the college entrance examination is generally presented through this “three-wire” More comprehensive, involving charged particles of electrical, stress, exercise, work and energy changes and other issues, but also become the entrance exam knowledge, ability to foothold, so sort out the “three lines” is the key to electric field review The following classification of such problems, given its characteristics, each break.First, the electric field lines and trajectories charged particle trajectory and electric field lines do not necessarily coincide, the electric field line is to describe the image of the imaginary geometric line of the actual electric field, the actual on