1. Tardigrade
  2. Question
  3. Physics
  4. When one end of the capillary is dipped in water, the height of water column is ‘h’. The upward force of 105 dyne due to surface tension is balanced by the force due to the weight of water column. The inner circumference of the capillary is (Surface tension of water = 7 × 10-2 N/m)

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. When one end of the capillary is dipped in water, the height of water column is ‘$h$’. The upward force of $105 $ dyne due to surface tension is balanced by the force due to the weight of water column. The inner circumference of the capillary is
(Surface tension of water = $7 \times 10^{-2} N/m$)

MHT CETMHT CET 2017

Solution:

Upward force acting $F =105$ dyne
$ =105 \times 10^{-5} N$
Surface tension of water $T =7 \times 10^{-2} N / m$
Surface tension acts at the circumference $C$ of the capillary tube.
$\therefore F = CT$
Or $105 \times 10^{-5}= C \times 7 \times 10^{-2}$
Or $C =15 \times 10^{-3} m$
$\Rightarrow C =15 \times 10^{-1}\, cm =1.5\, cm$