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Q.

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

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a

20 cm

b

80 cm

c

40 cm

d

10 cm

answer is C.

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Detailed Solution

h∞1r ⇒           h2=r1r2h1 ⇒           h2=rr/2×20 cm=40 cm.

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