CBSE 2025 · Region 5 · Set 1 · Q4 · 1 mark
A charged particle gains a speed of $\displaystyle 10^{6} \mathrm{~ms}^{-1}$, when accelerated from rest through a potential difference $\displaystyle 10$ kV. It enters a region of magnetic field of $\displaystyle 0.4$ T such that $\displaystyle \overrightarrow{\mathrm{v}} \perp \overrightarrow{\mathrm{B}}$. The radius of circular path described by it is:
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle 5$ cm
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.