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Q.

Water rise in capillary tube when its one end is dipped vertically in it, is 3 cm. If the surface tension of water is 75×10-3 N/m, then the diameter of capillary will be (Take angle of contact = 0°)

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a

0.1 mm

b

0.5 mm

c

1.0 mm

d

2.0 mm

answer is B.

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Detailed Solution

h = 2σcos θrρg or r = 2σcos θhρg

or r = 2×75×10-3×cos 0°3×10-2×103×10=0.5 mm

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