Water rises to a height of 10 cm in a glass capillary tube. If the area of cross-section of the tube is reduced to one fourth of the former value, what is the height of water rise now?
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a
20 cm
b
5 cm
c
2.5 cm
d
7 cm
answer is A.
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Detailed Solution
Area reduced to one-fourth. Radius reduced to one-half. Since h∝1r , therefore, h is doubled.