Question

2015 JEE) 100. Water rises to a height h in capillary tube. If the length of capillary tube above the surface of water is made less than h, then (a) water rises upto a point a little below the top and stays there. (b) water does not rise at all. (c) water rises upto the tip of capillary tube and then starts overflowing like a fountain. (d) water rises upto the top of capillary tube and stays there without overflowing.

PLS ans with full explanation ​

Answer 1

Explanation:

Now consider the second statement, if the length of the capillary tube is made less than h, It is clear that, Height h is inversely proportional to the capillary radius R. So, it is understandable that, when height above the surface is decreased, there won't be any motion as the water rises till height h and stays put

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Answer 2

Explanation:

It won't overflow. That should be obvious since doing so would create a constant flow, constantly using energy, but without any energy input.

The same force that pulls the water along the inside of the capillary tube also holds it there when it reaches the end. This force doesn't just pull upward, it pulls the water along the glass. At a certain height, the weight of the water column balances this pull. In that case the pull is upward since there is water below but not above.