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Q.

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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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

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