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Three capillary tubes of inner radii 0.5 mm, 1.0 mm and 1.5 mm stand in a beaker of water. Taking the surface tension of water as 7.5 x 10⁻² N/m, find the sum of the heights to which water rises in the three tubes.
- 5.5 cm
- 5 cm
- 6 cm
- 7.5 cm
Correct answer: 5.5 cm
Solution
Each tube's rise is inversely proportional to its radius; summing the three rises gives the total.
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