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NEET Sample Paper NEET Sample Test Paper-49

  • question_answer
    Two copper balls, each weighing 10 gm, are kept in air 10 cm apart. If one electron from every \[{{10}^{6}}\] atoms is transferred from one ball to the other, the coulomb force between them is - (Atomic weight of copper is 63.5)

    A) \[2.0\times {{10}^{4}}\,N\]                  

    B) \[2.0\times {{10}^{6}}\]

    C) \[2.0\times {{10}^{10}}N\]                  

    D) \[2.0\times {{10}^{\text{8}}}\,N\]

    Correct Answer: D

    Solution :

    \[{{q}_{1}}\,=\,\frac{1}{{{10}^{6}}}\times 1.6\times \,{{10}^{-19}}\times \frac{10}{63.5}\,\,\times {{10}^{23}}\,=\,{{q}^{2}}\] \[F=\frac{k{{q}_{1}}{{q}_{2}}}{{{r}^{2}}}\]


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