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# Need explanation for: 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 :

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 :

• Option 1)

water rises upto the top of capillary tube and stays there without overflowing.

• Option 2)

water rises upto a point a little below the top and stays there.

• Option 3)

water does not rise at all.

• Option 4)

water rises upto the tip of capillary tube and then starts overflowing like a fountain.

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As learnt

Ascent Formula -

$\frac{2T\cos \Theta }{\rho gr}$

- wherein

$T- surface Tension$

$r- radius\: of\: capillary\: tube$

$\rho -liquid\: density$

$\theta - Angle\ of \ contact$

If length of capillary tube is insufficient then contact angle will adjust itself such that water rises up to the top of capillary tube and stays there without flowing.

Option 1)

water rises upto the top of capillary tube and stays there without overflowing.

This option is correct

Option 2)

water rises upto a point a little below the top and stays there.

This option is incorrect

Option 3)

water does not rise at all.

This option is incorrect

Option 4)

water rises upto the tip of capillary tube and then starts overflowing like a fountain.

This option is incorrect

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