Properties Of Solids And Liquids Question 163
Question: Water rises in a capillary tube to a certain height such that the upward force due to surface tension is balanced by $ 75\times {{10}^{-4}}N $ force due to the weight of the liquid. If the surface tension of water is $ 6\times {{10}^{-2}}N{{m}^{-1}} $ , the inner circumference of the capillary must be[CPMT 1988, 86]
Options:
A) $ 1.25\times {{10}^{-2}}m $
B)$ 0.50\times {{10}^{-2}}m $
C) $ 6.5\times {{10}^{-2}}m $
D) $ 12.5\times {{10}^{-2}}m $
Show Answer
Answer:
Correct Answer: D
Solution:
$ 6\times {{10}^{-2}}\times $ Circumference = Force
$ \therefore $ Circumference $ =\frac{75\times {{10}^{-4}}}{6\times {{10}^{-2}}}=12.5\times {{10}^{-2}}m $
