如图所示一束电子以速度v垂直射入 磁感应强度为b宽度为d的匀强磁场区域穿出磁场时 电子的速度方�与入射时方�间的夹角为α 则电子的 Template




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tomski如图所示一束电子以速度v垂直射入 磁感应强度为b宽度为d的匀强磁场区域穿出磁场时 电子的速度方�与入射时方�间的夹角为α coloring