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 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 water meniscus decreases and therefore does not overflow.
c
The water forms a droplet on top of the tube but does not overflow.
d
The water starts overflowing.
answer is A.
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Detailed Solution
h = 2σ cosθrρg or h =2σ cos θ(R cos θ)ρgor h = 2σRρg or hR = constantIf h decreases, the radius of curvature of the meniscus increases.