CBSE 2026 · Region 2 · Set 2 · Q1 · 1 mark
Three point charges $\displaystyle +\mathrm{q},-2 \mathrm{q}$ and +q are placed along $\displaystyle x$-axis at points $\displaystyle x=-1 \mathrm{~m}, x=0 \mathrm{~m}$ and $\displaystyle x=2 \mathrm{~m}$ respectively. The potential energy of the system is
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle -\frac{2 \mathrm{q}^{2}}{3 \pi \varepsilon_{0}}$
Electrostatic Potential and CapacitancePotential Energy of a System of ChargesApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.