A capillary tube of radius r is lowered into a liquid of surface tension T and density $\mathrm{\rho }$ . Given angle of contact $=0^{\mathrm{o}}$ . The work done by surface tension will be

• A

  $\frac{{\mathrm{\pi T}}^2}{\mathrm{\rho g}}$

• B

  $\frac{4{\mathrm{\pi T}}^2}{\mathrm{\rho g}}$

• C

  $\frac{{\mathrm{T}}^2}{\mathrm{\rho g}}$

• D

  $\frac{2{\mathrm{T}}^2}{\mathrm{\rho g}}$