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Water rises to a height h in a capillary tube lowered vertically into water to a depth l as shown in the figure. The lower end of the tube is now closed, the tube is then taken out of the water and opened again. The length of the water column remaining in the tube will be

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h if $l \geq h$ and l+h if $l \leq h$

$\frac{h}{2}$ if $l \geq h$ and l+h if $l \leq h$

4 h if $l \geq h$ and l-h if $l \leq h$

2 h if $l \geq h$ and l+h if $l \leq h$

answer is A.

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Detailed Solution

When the capillary is inside the liquid, the surface tension force supports the weight of liquid of height ' h '.

When the capillary is taken out from the liquid similar type of surface tension force acts at the bottom also, as shown in second figure. Hence, now it can support weight of a liquid of height 2 h.

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