A capillary tube of radius r is lowered into a liquid of surface tension T and density ρ . Given angle of contact =0o . The work done by surface tension will be

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πT2ρg

4πT2ρg

T2ρg

2T2ρg

answer is B.

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Detailed Solution

Work done by surface tension 2πrTh=2πrT×2Trρg=4πT2ρg

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