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 $= T$ and density of water to be $\rho$)

  • A
    $\frac{2 \pi T}{\rho g}$
  • B
    $\frac{\pi T^2}{\rho g}$
  • C
    $\frac{2 \pi T^2}{\rho g}$
  • D
    None of these

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