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Q.

A liquid rises to a height of 50cm in a capillary tube of diameter 0.04mm. If density of liquid is 0.8 ×103 kg m3 and angle of contact is 20°, the surface tension of the liquid is (Cos 2 0° = 0.94)

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a

0.417Nm

b

4.17x10-2Nm

c

4.17Nm

d

4.17x 10-3Nm

answer is C.

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Detailed Solution

h=50cm=50×10−2mr=0.02×10−3,ρ=0.8×103cos⁡20∘=0.94;Tcos⁡θ=ρghr2T(0.94)=0.8×103×10×50×10−2×0.02×10−32T=4.17×10−2N/m

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