4

# A liquid of density 1.742 g $c{m}^{-3}$ is observed to show a capillary rise of 73 mm in a tube of radius 0.65 mm. Then the surface tension of the liquid is

4.1 x ${}^{{10}^{-2}}$ dynes $c{m}^{-1}$

4.1 x ${10}^{3}$ dynes $c{m}^{-1}$

7.1 x ${10}^{-3}$ dynes $c{m}^{-1}$

None of these

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