When a capillary tube is dipped in water, water 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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a
The radius of the meniscus increases and therefore water does not overflow
b
The radius of the meniscus decreases and therefore water does not overflow
c
The water forms a droplet on top of the tube but does not overflow
d
The water start overflowing
answer is A.
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Detailed Solution
capillary rise h= 2TRdg where R is the raidus of curvature. if h is insufficient then R increases and no overflow