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Question

A capillary tube of length (i) l = 60 cm, (ii) l = 50 cm and radius r = 1/4mm is immersed vertically into water. Find the capillary rise in both cases. Angle of contact = 0. Take coefficient of surface tension as 72 dyne/cm, g = 1000 cm s12.

A
57.6 cm
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B
7.6 cm
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C
6 cm
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D
5 cm
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Solution

The correct option is A 57.6 cm
57.6 cm
Sln :
h=h0=2Tcosθpgr
After substituting the value = 57.6 cm
a. Since l (= 60 cm) > h0
b. Since l (= 50 cm) < h0

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