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Haryana PMT Haryana PMT Solved Paper-1999

  • question_answer
    The force required to take away a flat circular plate of radius 5 cm on the surface of water, will be : (surface tension of water \[=75\times {{10}^{-3}}N/m\])

    A)  3.5 N                                    

    B)  7.5 \[\pi \] \[\times {{10}^{-3}}N\]

    C)  15 \[\pi \] \[\times {{10}^{-3}}N\]           

    D)  none of these

    Correct Answer: B

    Solution :

                    Using the relation, \[F=TL=T\times 2\pi R\] Here,    \[R=5cm=5\times {{10}^{-2}}m\]                 \[T=75\times {{10}^{-3}}N/m\] or            \[F=75\times {{10}^{-3}}\times 2\times \pi \times 5\times {{10}^{-2}}\] So,          \[F=7.5\pi \times {{10}^{-3}}N\]


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