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Punjab Medical Punjab - MET Solved Paper-2011

  • question_answer
    A metal wire of specific resistance\[64\times {{10}^{-6}}\Omega cm\]and length \[198cm\] has a resistance of\[7\Omega \]. The radius of the wire will be

    A) \[2.4cm\]                            

    B) \[0.24cm\]

    C) \[0.024\text{ }cm\]       

    D) \[24cm\]

    Correct Answer: C

    Solution :

    Specific resistance\[\rho =\frac{RA}{l}\]                                        \[=\frac{R\pi {{r}^{2}}}{l}\] \[\Rightarrow \]                                 \[{{r}^{2}}=\frac{\rho l}{R\pi }\]                                       \[=\frac{64\times {{10}^{-6}}\times 198}{7\times 3.14}\]                                   \[r=0.024\,\,cm\]


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