Two similar spheres having +q and -q charge are kept at a certain distance. $\Gamma$ force acts between the two. If in the middle of two spheres, another similar sphere having +q charge is kept, then it experience a force in magnitude and direction as
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Initially, force between A and C
$F = k \frac{Q_1 Q_2}{r^2}$
When a similar sphere B having charge +Q is kept at the mid point of line joining A and C, then Net force on B is $F_{\text{net}} \equiv F_{A} + F_{c}$ $=k\frac{Q^{2}}{\left(r/2\right)^{2}}+\frac{kQ^{2}}{\left(r/2\right)^{2}}=8\frac{kQ^{2}}{r^{2}}=8F$ .
(Direction is shown in figure)
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