5.如图所示在第一象限内有垂直纸面�里的匀强磁场一对正负电子分别以相同速度沿与x轴成30°角从原点射入磁场则正负电子在磁场中运动时间 Template




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tomski5.如图所示在第一象限内有垂直纸面�里的匀强磁场一对正负电子分别以相同速度沿与x轴成30°角从原点射入磁场则正负电子在磁场中运动时间 coloring