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Q.

Water rises to a capillary tube to a height of e cm. If the area of cross section of the tube is one-fourth, the water will rise to a height of

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a

2 cm

b

4 cm

c

8 cm

d

16 cm

answer is C.

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Detailed Solution

h=2Tcos⁡θρrg  or  h∝1rWhen area of cross-section becomes one-fourth, the radius is halved and hence ft is doubled, i.e, 8 cm.
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