23.如图所示在水平正交的匀强电场和匀强磁场b中半径为r的光�绝缘竖直圆环上套有一个带电量为q带正电的小球已知小球所受电场力与重力相等 Template




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tomski23.如图所示在水平正交的匀强电场和匀强磁场b中半径为r的光�绝缘竖直圆环上套有一个带电量为q带正电的小球已知小球所受电场力与重力相等 coloring