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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
    A wooden stick 2m long is floating on the surface of water. The surface tension of water 0.07 N/m. By putting soap solution on one side of the sticks the surface tension is reduced to 0.06 N/m. The net force on the stick will be [Pb. PMT 2002]

    A) 0.07 N

    B)                      0.06 N

    C)             0.01 N

    D)             0.02 N

    Correct Answer: D

    Solution :

                    Net force on stick\[={{F}_{1}}-{{F}_{2}}=({{T}_{1}}-{{T}_{2}})l\]             \[=(0.07-0.06)l=0.01\times 2=0.02N\]


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