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Q.

A capillary tube of diameter 0.4mm is dipped in a beaker containing mercury. If density of mercury is 13.6×103 kg/m3,

surface tension 0.49Nm-1, angle of contact 1350 the depression of the meniscus in the capillary tune will be 

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a

0.13m

b

0.013m

c

0.026m

d

0.0026m

answer is C.

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Detailed Solution

The formula for the capillary tube's level's height is,

h=2Tcosθrρg

substituting the values,

h=2×0.49×cos13513.6×103×0.42×10-3×9.8

h=(2×0.49)×(0.707126.656)26.656=0.026m

Hence the correct answer is 0.026m

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