Question

A capillary tube of radius 0.105 mm is dipped into a liquid whose density is 0.79 $gcm^{-3}$. The liquid rises in this capillary to a height of 6.30 cm. Calculate the surface tension of the liquid (g=980 cm $sec^{-2}$)

• A. $25.6 \;dynes \;cm^{-1}$
• B. $51.2 \;dynes \;cm^{-1}$
• C. $12.8 \;dynes \;cm^{-1}$
• D. $20.6 \;dynes \;cm^{-1}$

Answer 1

Answer: (A)

$25.6 \;dynes \;cm^{-1}$

Answer 2

The correct answer is (A) : $25.6 \;dynes \;cm^{-1}$