59. A very narrow capillary tube records a rise of 20cm 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:
(a) 10cm
(b) 20cm
fet 40cm
(d) 80cm
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Answer is Option (b)
Explanation:
- Let A be are of cross-section of tube.
then new area after changes made
or is directly proportional to radius.
Also, Height of rise, h =
or h =
Hence, h', change in height =
or
Rise in height of Level = 20 cm
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