Two copper balls, each weighing $10\,g$ 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

    $2.0 \times {10^{10}}\,N$

  • B

    $2.0 \times {10^4}\,N$

  • C

    $2.0 \times {10^8}\,N$

  • D

    $2.0 \times {10^6}\,N$

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