The new force acting between the charges in terms of f given the data from the question is half f
F = Kq₁q₂ / r²
Where
F = Kq₁q₂ / r²
F₁ = f = Kq₁q₂ / d²
F = Kq₁q₂ / r²
F₂ = K2q₁q₂ / (2d²
F₂ = 2Kq₁q₂ / 4d²
F₂ = Kq₁q₂ / 2d²
F₂ = ½(Kq₁q₂ / d²)
But
f = Kq₁q₂ / d²
Therefore
F₂ = ½f = half f
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