A cylindrical capillary tube of radius 0.2 mm is dipped into a liquid of surface tension 40 dyne/cm. If the height of the liquid column rises by 1.5 cm, the contact angle of the liquid with the tube is _______degree.
[Given: \(\rho= 1\ gm/cm^3\), \(g=9.8\ m/s^2\)]
(rounded off to the nearest integer)
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