Solution:
Using capillary rise formula \(h = \frac{2T \cos\theta}{r \rho g}\) with \(\theta = 0^\circ\) in CGS: \(4 = \frac{2 \times 60 \times 1}{r \times 1 \times 1000} ⇒ r = 0.03\text{ cm}\).
Water rises to a height of 4 cm in a capillary tube. If surface tension of water is 60 dyne/cm, then radius of capillary tube is:
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