CBSE 2024 · Region 4 · Set 1 · Q1 · 1 mark
Two charges $\displaystyle +q$ each are kept ' $\displaystyle 2 a$ ' distance apart. A third charge $\displaystyle -2 q$ is placed midway between them. The potential energy of the system is -
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle \frac{-7 q^{2}}{8 \pi \varepsilon_{0} a}$
Electrostatic Potential and CapacitancePotential Energy of a System of ChargesApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.