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AP EAMCET20228 Jul 2022Evening ShiftPhysicsMechanical Properties of FluidsActual

Consider a circular ring of radius 1,4 ~cm lying on the surface of a liquid. If a vertical force of 0.022 ~N greater than the weight of the ring is required to lift this ring from the liquid surface, then the surface tension of the liquid is

Options

  1. A0.085 Nm ⁻¹
  2. B0.125 Nm ⁻¹
  3. C0.250 Nm ⁻¹
  4. D0.465 Nm ⁻¹

Correct answer

B. 0.125 Nm ⁻¹

Step-by-step solution

The given situation is shown below. Force required to lift the ring, F=2 (r+r) T+W F=4 r T+W Now given, F=0.022+W and r=1.4 ~cm So, 0.022+W=4 1.4 T+W0.022+4 22 7 1.4 T 0.022 7 4 22 1.4 =T or T=125 10⁻³=0.125 ~N / m .

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