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 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)

Less than 10 cm

Answer 2

As temperature increases;

surface tension decreases ;

As h = $\frac{2T\cos\theta}{R\rho g}$ \ h also decreases.