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A uniform rod is kept vertically on a horizontal smooth surface at a point O. If it is rotated slightly and released, it falls down on the horizontal surface. The lower end will remain:

1. At O.
2. At a distance less than $\frac{\text{l}}2{}$ from O.
3. At a distance $\frac{\text{l}}2{}$ from O.
4. At a distance larger than $\frac{\text{l}}2{}$ from O.