Mathematically, this can be written as:
\[F_{BA} = k \frac{|Q_1 \cdot Q_2|}{r^2}\]
where \(F_{BA}\) is the force on B due to A, \(k\) is Coulomb's constant, \(Q_1\) and \(Q_2\) are the charges on the spheres, and \(r\) is the distance between the spheres.
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