CBSE 2025 · Region 6 · Set 3 · Q3 · 1 mark
A particle of mass $\displaystyle m$ and charge $\displaystyle q$ moving with velocity $\displaystyle v \hat{i}$ is subjected to a uniform electric field $\displaystyle \mathrm{E} \hat{\mathrm{j}}$. The particle will initially have a tendency to move in a circle of radius:
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle \left(\frac{\mathrm{mv}^{2}}{\mathrm{qE}}\right)$ in $\displaystyle \mathrm{x}-\mathrm{y}$ plane
Moving Charges and MagnetismMotion in a Magnetic FieldApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.