A liquid is filled into a tube with semi elliptical cross section as shown in the figure. The ratio of the surface tension forces on the curved part and the plane part of the tube in vertical position will be:
A
π(a+b)4b
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B
2πab
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C
πa4b
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D
π(a−b)4b
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Solution
The correct option is Aπ(a+b)4b From the figure,
Curved part = Semi perimeter = \dfrac{\pi(a+b)}{2}$