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磁场问题一直是高考的热点和难点,曾多次出现,各省市的模拟试卷中也是屡见不鲜,其中不乏情景新颖的原创好题.下面是我市的一道统考试题,值得探讨和研究:(盐城市2008年4月高三第二次调研考试第14题)如图1所示,两个同心圆,半径分别为r和2r,在两圆之间的环形区域内存在垂直纸面向里的匀强磁场,磁感应强度为 B.圆心 O处有一放射源,放出粒子的质量为 m,带电量为 q,假设粒子速度方向都和纸面平行.
The magnetic field problem has always been a hot and difficult problem in the college entrance examination. It has appeared many times in various provinces and cities in the simulation test papers. Many of them are original, original, and novel topics. The following is an examination question in our city. It is worth exploring and studying: (Yancheng In April 2008, the third year of the second research examination Question No.14) As shown in Figure 1, two concentric circles, radius r and 2r, respectively, in the annular area between the two circles in the vertical paper surface facing the uniform magnetic field The magnetic induction intensity is B. There is a radioactive source at the center O, the mass of the discharged particles is m, and the charge quantity is q. It is assumed that the direction of the particle velocity is parallel to the paper surface.