论文部分内容阅读
2011年第28届全国中学生物理竞赛预赛第15题是一道考查如何设置合理的磁场使带电粒子由分散到平行的问题,原题为:图中坐标原点O(0,0)处有一带电离子源,向y≥0一侧
The twenty-fifth session of the 28th National High School Physics Contest in 2011 is a test to find out how to set up a reasonable magnetic field to disperse the charged particles to be parallel. The original title is as follows: The coordinate origin O (0,0) , To y ≥ 0 side