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Water rises in a capillary tube upto a height h so that the upward force due to surface tension is balanced by the force due to the weight of the water column. If this force is 75xx10^-5N and surface tension of water is 6xx10^-2N/m. Then what is the inner circumference of the capillarity? |
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Answer» Solution :UPWARD force DUE to ST = WEIGHT of the lifted liquid `therefore T = F/l `therefore` upward force `F = T xx L = T xx 2pir` `therefore T xx 2pir = mg` INNER circumference of the capillary = `2pir = (mg)/T = (90 xx 10^-5)/(6 xx 10^-2)` [`because 1N = 10^5` dyne] `15 xx 10^-3 = 1.5 xx 10^-2 m` |
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