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求解带电粒子在磁场中的轨迹问题的本质是平面几何知识与物理知识的综合应用.因为这类问题灵活善变,最能体现学生数理结合的综合应用能力,历年来为高考命题所青睐.带电粒子在匀强磁场中的运动轨迹是圆弧,离不开圆的几何知识.当磁场区域受圆形边界约束时,轨迹问题实际上是二圆相交问题.
The essence of solving the trajectory problem of charged particles in the magnetic field is the comprehensive application of plane geometry knowledge and physics knowledge, because these problems are flexible and changeable, which can best embody the comprehensive application ability of the combination of students’ mathematics and physics, and have been favored by college entrance examination proposition over the years. When the magnetic field is bound by the circular boundary, the trajectory problem is actually the intersection of two circles.