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Water rises is a vertical capillary tube of radius 1 mm. Surface tension of water is 0.07 N/m. A and B are two points just above and just below the free surface of water in the capillary tube. The difference in pressure at A and B is

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a

1400 N/m2

b

140 N/m2

c

720 N/m2

d

1100 N/m2

answer is B.

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Detailed Solution

Glass-water angle of contact is 0o. The free surface of water inside the capillary tube is part of an air bubble of radius r=1 mm.∴ pA−pB=2Sr=2×0.0710−3 N/m2=140 N/m2

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