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

  • question_answer
    The force required to take away a flat circular plate of radius 2 cm from the surface of water, will be (the surface tension of water is 70 dyne/cm)                                   [Pb. PET 2001]

    A)             \[280\pi \,dyne\]

    B)                      \[250\pi \,dyne\]

    C)             \[140\pi \,dyne\]

    D)                      \[210\pi \,dyne\]

    Correct Answer: A

    Solution :

        Force required, \[F=2\pi rT=2\pi \times 2\times 70=280\pi .Dyne\]


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