If 'M' is the mass of water that rises in a capillary tube of radius 'r', what is the mass of water that rises in a capillary tube of radius '2r' (same liquid and conditions)?

Correct answer: 2M

Solution

The risen height varies as 1/r, but the cross-sectional area varies as r², so the mass (proportional to r² * h) varies as r. Doubling the radius doubles the mass.

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