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Physics · 2025 · 1 mark
CBSE 2025 · Region 5 · Set 3 · Q3
Four point charges Q each, are held at the four corners of a square of side l. The amount of work done in bringing a charge Q from infinity to the…
Four point charges Q each, are held at the four corners of a square of side $\displaystyle l$. The amount of work done in bringing a charge Q from infinity to the centre of the square will be:
Official answer
(B)
$\displaystyle \frac{\sqrt{2} \mathrm{Q}^{2}}{\pi \varepsilon_{0} l}$
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CBSE Class 12 Physics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.