First slide

Surface tension

Question

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

Moderate

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

Solution

$c a p i l l a r y r i s e h = \frac{2 T}{R d g} w h e r e R i s t h e r a i d u s o f c u r v a t u r e . i f h i s i n s u f f i c i e n t t h e n R i n c r e a s e s a n d n o o v e r f l o w$

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