It’s scandalous!

If two point charges +q+q and q-q are separated by distance d,d, then according to Coulomb's law, the attractive force between them is

Fe=keq2d2,F_e=k_e\frac{q^2}{d^2},

where kek_e is Coulomb's constant. But what if the charges were distributed on spheres instead of at points? Two charged conducting spheres with charges +q+q and q-q are separated by center-to-center distance d.d.

The attractive force between them is __________.\text{\_\_\_\_\_\_\_\_\_\_}.

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