When a capillary tube is dipped in water it rises upto 8 cm in the tube. What happens when the tube is pushed down such that its end is only 5 cm above the outside water level

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The radius of the meniscus increases and therefore water does not overflow

The radius of the meniscus decreases and therefore water does not overflow

The water forms a droplet on top of the tube but does not overflow

The water start overflowing

answer is A.

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Detailed Solution

h=2TRdg⇒hR=2Tdg=constant , when h decreases, R increases.l r =l' r'

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