A glass capillary tube is of the shape of a truncated cone with an apex angle a so that its two ends have cross-sections of different radii. When dipped in water vertically, the water rises in it to a height h, where the radius of its cross-section is b. If the surface tension of water is S, its density is 
, and its contact angle with glass is 
, then value of h will be (g is the acceleration due to gravity)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
If R be the meniscus radius,
Excess pressure on concave side of meniscus 
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