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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a
πT2ρg
b
4πT2ρg
c
T2ρg
d
2T2ρg
answer is B.
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Detailed Solution
Work done by surface tension 2πrTh=2πrT×2Trρg=4πT2ρg