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Q.

A straw of circular cross-section of radius R and negligible thickness is dipped vertically into a liquid of surface tension T. If the contact angle between the liquid and the straw material is 53∘. The force acting on the straw due to surface tension of the liquid is (cos⁡53∘=0.6)

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a

6πRT5

b

4πRT5

c

3πRT5

d

12πRT5

answer is A.

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Detailed Solution

F=22πRTcos53o=12πRT5  

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