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Two point charges $+\mathrm{q}_{1}$ and $+\mathrm{q}_{2}$ are placed a finite distance ' $\mathrm{d}$ ' apart. It is desired to put a third charge $\mathrm{q}_{3}$ in between these two charges so that $\mathrm{q}_{3}$ is in equilibrium. This is
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possible irrespective of the sign of $q_{3}$.
At null point $\vec{E}=0$
$\therefore$ any charge placed at that point will remain in equilibrium.
$\therefore$ any charge placed at that point will remain in equilibrium.
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