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PhysicsNEET 2019Surface tension, capillarity, excess pressure

Mechanical Properties of Fluids

A soap bubble, having a radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5×10−2 N/m2.5 \times 10^{-2}\ \mathrm{N/m}. The excess pressure inside the bubble equals the pressure at a point Z0Z_0 below the free surface of water in a container. Taking g=10 m/s2g = 10\ \mathrm{m/s^2} and density of water =103 kg/m3= 10^3\ \mathrm{kg/m^3}, the value of Z0Z_0 is:

  1. A.100 cm
  2. B.10 cm
  3. C.1 cm✓
  4. D.0.5 cm

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