Question

In a capillary tube experiment, a vertical $30 \, cm$ long capillary tube is dipped in water. The water rises up to a height of $10 \, cm$ due to capillary action. If water temperature increases, then the new height of water column in capillary becomes

• A. $30 \, cm$
• B. greater than $10 \, cm$
• C. equal to $10 \, cm$
• D. less than $10 \, cm$

Answer 1

Answer: (D)

As temperature increases, surface tension decreases ;
As $h=\frac{2 T}{Rρg}$
$\therefore h$ also decreases.