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Physics · 2025 · 1 mark
CBSE 2025 · Region 4 · Set 2 · Q3
A particle with charge q moving with velocity v =v_0 i enters a region with magnetic field B = B_1 j + B_2 k. The magnitude of force experienced by…
A particle with charge $\displaystyle q$ moving with velocity $\displaystyle \vec{v}=v_{0} \hat{i}$ enters a region with magnetic field $\displaystyle \overrightarrow{\mathrm{B}}=\mathrm{B}_{1} \hat{\mathrm{j}}+\mathrm{B}_{2} \hat{\mathrm{k}}$. The magnitude of force experienced by the particle is :
Official answer
(C)
$\displaystyle q v_{0} \sqrt{\left(\mathrm{B}_{1}^{2}+\mathrm{B}_{2}^{2}\right)}$
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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.