A liquid is containe in a vertical tube ...

A liquid is containe in a vertical tube of semicircular cross section figure.The contact angle is zero. The force of surface tension on the curved part and on the flat part are in ratio

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The correct Answer is:

Effective length of flat part`=2r`
Effective length of curved part is `pir`
`F=sigmal`
So, required ratio is `2:pi`

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