A cylindrical capillary tube of 0.2 mm radius is made by joining two capillaries ti and T 2 of different materials having water contact angles of 0° and 60°, respectively. The capillary tube is dipped vertically in water in two different configurations, case I and II as shown in figure. Which of the following option(s) is (are) correct? [Surface tension of a water = 0.075 N/m, density of water = 1000 kg/m 3 , take g = 10 m/s 2 ]
Text Solution
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(a, c, d)
When T 1 is in contact with water
then 
= 7.5cm<8cm.
But in option height is insufficient.
When T 2 is in contact with water
then h = 
= 3.75cm<5cm
Volume of water in the meniscus depends upon the angle of contact.
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