Q. 19

The capillaries shown in figure (14-E4) have inner radii 0.5 mm, 1.0 mm and 1.5 mm respectively. The liquid in the beaker is water. Find the heights of water level in the capillaries. The surface tension of water is 7.5 × 10-2 N m-1.



Answer :

3 cm in A, 1.5 cm in B, 1 cm in C

Given, Surface tension of water,


The rise in capillary is given by


And for water,


For capillary A, radius,


Rise


For capillary B, radius,


Rise


For capillary C, radius,


Rise


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