如图17所示半径为r的圆形区域内存在着垂直纸面�里的匀强磁场磁感应强度为b现有一带电离子从a以速度v沿圆形区域的直径射入磁场已知离子从 Template




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tomski如图17所示半径为r的圆形区域内存在着垂直纸面�里的匀强磁场磁感应强度为b现有一带电离子从a以速度v沿圆形区域的直径射入磁场已知离子从 coloring