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BVP Medical BVP Medical Solved Paper-2010

  • question_answer
    Two copper balls, each weighing 10 g, arekept in air 10 cm apart. If one electron from every \[\frac{\lambda }{2(\mu -1)}\] atoms is transferred from one ballto the other, the coulomb force betweenthem is (atomic weight of copper is 63.5)

    A)  \[\overset{0}{\mathop{A}}\,\]                

    B) \[8\times {{10}^{-4}}red\]

    C) \[6\times {{10}^{-4}}red\]                           

    D) \[4\times {{10}^{-4}}red\]

    Correct Answer: C

    Solution :

                    Number of electrons, n \[=\frac{6\times {{10}^{23}}}{63.5}\times 10\times \frac{1}{{{10}^{6}}}=\frac{6\times {{10}^{18}}}{63.5}\] \[q=\frac{6\times {{10}^{18}}\times 1.6\times {{10}^{-19}}}{63.5}C\]                 or            \[q=1.5\times {{10}^{-2}}C\]                                 \[F=\frac{9\times {{10}^{9}}\times 1.5\times {{10}^{-2}}\times 1.5\times 10h-2}{{{\left( \frac{10}{100} \right)}^{2}}}\]                                 \[=2.0\times {{10}^{8}}N\]


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