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JEE Main & Advanced Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank Surface Energy

  • question_answer
    A spherical drop of oil of radius 1 cm is broken into 1000 droplets of equal radii. If the surface tension of oil is 50 dynes/cm, the work done is                             [MP PET 1990]

    A) 18\[\pi \]ergs

    B)                       180\[\pi \]ergs

    C)             1800\[\pi \]ergs

    D)             8000\[\pi \]ergs

    Correct Answer: C

    Solution :

                    \[W=4\pi {{R}^{2}}T({{n}^{1/3}}-1)\]\[=4\pi \times 1\times 50({{10}^{3/3}}-1)\] = \[1800\pi \ erg\]


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