如图所示在圆形区域内存在垂直纸面�外的匀强磁场ab是圆的直径.一不计重力的带电粒子从a点射入磁场速度大小为v当速度方�与ab成30°角 Template




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tomski如图所示在圆形区域内存在垂直纸面�外的匀强磁场ab是圆的直径.一不计重力的带电粒子从a点射入磁场速度大小为v当速度方�与ab成30°角 coloring