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From a water tap, liquid comes out in from of cylinder. As water moves down, radius of that cylinder decreases. Consider, a very small element of height h and and radius R (due to smell height radius is assumed to be constant) This element is given in the diagram. An imaginary cross-section ABCD divides this element in two equal semi cylinder. S is surface tensionof liquid. Now choose correct statement(s) A. Surface energy of this elementary cylinder is `S[2piRh+2piR^(2)]`B. Pressure inside the cylinder is more than atmospheric pressure by` (2S)/(R )`C. Force exerted by one half cylinder on another half cylinder due to surface tension is 2Sh.D. Surface energy of this elementary cylinder is `Sxx2piRh` |
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Answer» Correct Answer - C::D `"Surface energy" = "free surface area" xx "surface tension"` for a cylindrical surface excess pressure is `(S)/(R )` |
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