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A capillary tube made of glass of radius 0.15 mm is dipped vertically in a beaker filled with methylene iodide (surface tension = 0.05 Nm-1, density = 667 kg m-3) which rises to height h in the tube. It is observed that the two tangents drawn from observed that the two tangents drawn from liquid-glass interfaces (from opp. sides of the capillary) make an angle of 60° with one another. Then h is close to (g = 10 ms-2)

(1) 0.087 m 

(2) 0.137 m 

(3) 0.172 m 

(4) 0.049 m

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