如图所示一束电子以速度v0垂直射入磁感应强度为b宽度为d的匀强磁场中穿过磁场时速度方�与电子原来入射方�的夹角是30°则电子的质量是 Template




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tomski如图所示一束电子以速度v0垂直射入磁感应强度为b宽度为d的匀强磁场中穿过磁场时速度方�与电子原来入射方�的夹角是30°则电子的质量是 coloring