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AP EAMCET2010PhysicsMechanical Properties of Fluids

The excess pressure inside a spherical soap bubble of radius 1 ~cm is balanced by a column of oil (Specific gravity =0.8 ), 2 ~mm high , the surface tension of the bubble is

Options

  1. A3.92 ~N / m
  2. B0.0392 ~N / m
  3. C0.392 ~N / m
  4. D0.00392 ~N / m

Correct answer

B. 0.0392 ~N / m

Step-by-step solution

The excess pressure of soap bubble p= 4 T R h g= 4 T R T= R h g 4 = 1 10⁻² 2 10⁻³ 0.8 10^3 9.8 4 =3.92 10⁻² ~N / m =0.0392 ~N / m

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