It’s scandalous!

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

\[F_e=k_e\frac{q^2}{d^2},\]

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

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

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