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从近年高考试题看,电磁场知识是历年高考试题中考点分布的重点区域,预计2014年高考占分比例仍在25%左右,计算题一般考查综合运用能力,知识覆盖面广,综合性强,多为综合场中带电粒子的运动问题。一、三种场力的特点1.重力的大小为mg,方向竖直向下,重力做功与路径无关,其数值除与带电粒子的质量有关外,还与初、末位置的高度差有关。2.电场力的大小为qE,方向与电场强度E及带电粒子所带电
According to recent college entrance examination exams, the knowledge of electromagnetic field is the key area for the distribution of entrance exams over the years. It is estimated that the college entrance examination in 2014 will still account for about 25% of the total. The calculation questions generally examine the comprehensive utilization ability. The knowledge covers a wide range and is comprehensive Synthetic Field Charged Particle Motion Problem. First, the characteristics of three kinds of field strength 1. The size of gravity is mg, the direction of vertical downward, gravity work has nothing to do with the path, the value of the charged particles in addition to the quality of the relevant, but also with the beginning and end of the height difference. 2. The size of the electric field force qE, the direction and the electric field strength E and charged particles charged