Question

Water rise in a capillary tube to a certain height such that upward force due to surface tension is balnced by 75*10-4

Answer 1

Answer:

Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by 75 × 10-4 N, forces due to the weight of the liquid. If the surface tension of water is 6 × 10-2 N/m, the inner-circumference of the capillary must be

Option 1) 1.25\times10^{-2}m Option 2) 0.50\times10^{-2}m Option 3) 6.5\times10^{-2}m Option 4) 12.5\times10^{-2}m

Explanation:

If a tube of very narrow bore is dipped in a liquid, the liquid in the capillary either ascends or descends .

- wherein

A towel soaks water.

Total upward force =circumference \times surface\: tension

=circumference\times 6\times 10^{-2}

Total upward force = weight of the liquid

=circumference\times 6\times 10^{-2}=75\times 10^{-4}

circumference =\frac{75\times 10^{-4}}{6\times 10^{-2}}

=12.5\times 10^{-2}m