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电场、磁场是近几年高校自主招生考试的必考内容,同时也是高考的热点问题.近几年江苏高考物理卷都是以带电体在电磁场中的运动作为压轴考题,“北约”、“华约”试卷也将带电体在电场、磁场中运动作为重要内容考查.为应对新的自主招生考试模式,笔者根据几例自主招生考题谈谈带电体在电场和磁场中圆周运动这一重要的模型.1电场中的限定轨道圆周运动图1题1.(2013年北约试题).如图1所示,在水平
Electric field, magnetic field is the college entrance examination in recent years, the necessary test content, but also a hot topic in the entrance examination. In recent years, Jiangsu physical college entrance examination are charged body in the electromagnetic field as the finale of the test, “NATO” “Hua Jiao ” papers also charged body in the electric field, the movement of the magnetic field as an important content test.In response to the new self-enrollment examination mode, the author based on several self-enrollment examination questions about charged body in the electric field and magnetic field in circular motion this An Important Model .1 Boundary orbit circular motion in an electric field Figure 1 Problem 1. (2013 NATO test) As shown in Figure 1, at the horizontal