Q.

Consider a vertical parallel of semi-circular cross-section dipped in a liquid. Assume that the wetting of the tube is complete. The force of surface tension on the flat part and on curved part of the tube are in the ratio

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a

2 : π

b

1 : π

c

3 : π

d

2.7 : π

answer is A.

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Detailed Solution

Effective length of flat part = 2rEffective length of curved part is πrF = σlSo, required ratio is 2 : π.
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Consider a vertical parallel of semi-circular cross-section dipped in a liquid. Assume that the wetting of the tube is complete. The force of surface tension on the flat part and on curved part of the tube are in the ratio