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BCECE Engineering BCECE Engineering Solved Paper-2011

  • question_answer
    The material of a wire has a density of \[1.4\,g/c{{m}^{3}}\]. If it is not wetted by a liquid of surface tension 44 dyne/cm, then the maximum radius of the wire which can float on the surface of liquid is

    A) \[\frac{10}{28}cm\]                                        

    B) \[\frac{10}{14}cm\]

    C)  \[\frac{10}{7}cm\]         

    D)         \[0.7cm\]

    Correct Answer: C

    Solution :

                    \[2Tl=\pi {{r}^{2}}ld\times g\] \[r=\sqrt{\left( \frac{2T}{\pi dg} \right)}=\sqrt{\frac{2\times 44\times 7}{22\times 1.4\times 980}}\] \[=\frac{1}{7}cm=\frac{10}{7}mm\]


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