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0.05kg * 1000g/1kg * 1 mole/26.982g * (6.023 X 10^23) atoms/ 1 mole * 13 electrons / 1 atom = 9.43117 X 10^25 electrons

If an electron is removed from one sphere it become +e and if an electron is added to the other sphere it becomes -e so the number of electrons that must be subtracted and added = (Ne) and (-Ne).

Thus

F=k(Ne)(-Ne)/.8m^2

but since the force = k * the magnitude of the product of the charges / r^2

1.00 X 10^4 N= k(Ne)^2/0.64m^2

(1.00X10^4N)*(.64m^2)/k = (Ne)^2

(1.00X10^4N)*(.64m^2)/k = (N^2) * (1.6X10^-19)^2

(1.00X10^4N)*(.64m^2)/[k* (1.6X10^-19)^2] = N^2

sqrt((1.00X10^4N)*(.64m^2)/[k* (1.6X10^-19)^2]) =N

9.90243 X 10^7 electrons = N

The ratio is 9.90243 X 10^7 / 9.43117 X 10 ^25

Did I do this correctly?

Thank you.

Stephen