Mercury has an angle of contact equal to 140° with soda-lime glass. A narrow tube of radius 1.00 mm made of this glass is dipped in a trough containing mercury. By what amount does the mercury dip down in the tube relative to the liquid surface outside? [The surface tension of mercury at the temperature of the experiment is 0.465 N m–1. The density of mercury = 13.6 × 103 kg m–3.]

1. 4.21 mm
2. 5.34 mm
3. 3.12 mm
4. 6.16 mm

Subtopic:  Capillary Rise |
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NEET 2025 - Target Batch