Two copper balls, each weighing 10 g are...

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)

`2.0xx 10^10 N`

`2.0xx 10^4 N`

`2.0xx 10^8 N`

`2.0xx 10^6 N`

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