The heat evolved for the rise of water when one end of the capillary tube of radius r is immersed vertically into water is (assume surface tension = I and density of water to be p)

• A

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

• B

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

• C

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

• D

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