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The following observations were taken for determining surface tension T of water by capillary method : diameter of capillary, D = 1.25 × 10 –2 m rise of water, h = 1.45 × 10 –2 m. Using g = 9.80 m/s 2 and the simplified relation T = 2 rhg × 10 3 N/m, the possible error in surface tension is closest to -

1. 0.15%
2. 1.5%
3. 2.4%
4. 10% Students may find similar question in CP exercise sheet : [ JEE Advance, Chapter : Practical Physics, Ex.2, Page No.70, Q. No.7 ]

Correct answer: 1.5%

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