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Q.

A capillary glass tube records a rise of 20 cm when dipped in water. When the area of cross-section of the tube is reduced to half of the former value, water will rise to a height of

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a

102 cm

b

20 cm

c

10 cm

d

202 cm

answer is D.

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Detailed Solution

Area is halved, means radius of tube is made 12 times.

h=2Tcosθrpg or h∝1r

Hence, h will become 2 times.

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