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Physics · 2026 · 1 mark
CBSE 2026 · Region 2 · Set 1 · Q1
Three point charges 2q, -2q and q are kept at the vertices of an equilateral triangle of side l. The potential energy of the system is
Three point charges 2q, -2q and q are kept at the vertices of an equilateral triangle of side $\displaystyle l$. The potential energy of the system is
Official answer
(D)
$\displaystyle \frac{-\mathrm{q}^{2}}{\pi \varepsilon_{0} l}$
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CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.