CBSE 2026 · Region 5 · Set 2 · Q8 · 1 mark
A charged particle of mass m having kinetic energy K passes undeflected through a region with electric field $\displaystyle \overrightarrow{\mathrm{E}}$ and magnetic field $\displaystyle \overrightarrow{\mathrm{B}}$ acting perpendicular to each other. The mass m of the particle will be :
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle \frac{2 \mathrm{~KB}^{2}}{\mathrm{E}^{2}}$
Moving Charges and MagnetismMagnetic ForceApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.