以下一道关于带电粒子在有界磁场中运动的试题,涉及的物理知识是带电粒子在匀强磁场中受到洛伦兹力作用下做匀速圆周运动与场区外的匀速直线运动问题,但此题立意很高,全面考查了同学们的综合能力.题目如图1所示,K是粒子发生器,D_1、D_2、D_3是三块挡板,通过传感器可控制它们定时开启和关闭. The following article on the movement of charged particles in a bounded magnetic field test, involving the physical knowledge of charged particles in a uniform magnetic field by the Lorentz force to do a uniform circular motion and uniform linear motion outside the field, but this question The idea is very high, a comprehensive examination of the students’ comprehensive ability.The subject is shown in Figure 1, K is a particle generator, D_1, D_2, D_3 is a three baffle, through the sensor can control their timing on and off.