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 in trandferred from one ball to the other, the coulomb force between them is (atomic weight of copper is `63.5`)

`2.0 xx 10^(10)N`

`2.0 xx 10^(4) N`

`2.0 xx 10^(8)N`

`2.0 xx 10^(6)N`

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