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Q.

A capillary tube of length l = 50 cm and radius r = 14mm is immersed vertically into water. Find the capillary rise if Angle of contact = 00 and coefficient of surface tension = 72 dyne/cm. (Take g = 1000 cm/s2).

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a

30 cm

b

35 cm

c

40 cm

d

50 cm

answer is D.

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Detailed Solution

h = ho = 2T cosθρgr     = 2(72) cos 00(1)(1000)(140)  = 57.6 cmSince l (= 50 cm) < hoh = 50 cm
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