2.如图10所示一束电子电量为e以速度v垂直射入磁感应强度为b宽度为d的匀强磁场中穿透磁场时速度方�与电子原来入射方�的夹角是30 Template




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tomski2.如图10所示一束电子电量为e以速度v垂直射入磁感应强度为b宽度为d的匀强磁场中穿透磁场时速度方�与电子原来入射方�的夹角是30 coloring