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Physics · 2020
JEE Main · 7 January 2020, Shift 2 · Q10
A particle of mass m and charge q has an initial velocity v =v_0 j. If an electric field E = E_0 i and magnetic field B = B_0 i act on the particle,…
A particle of mass $\displaystyle m$ and charge $\displaystyle q$ has an initial velocity $\displaystyle \vec{v}=v_0 \hat{j}$. If an electric field $\displaystyle \overrightarrow{\mathrm{E}}=\mathrm{E}_0 \hat{i}$ and magnetic field $\displaystyle \overrightarrow{\mathrm{B}}=\mathrm{B}_0 \hat{i}$ act on the particle, its speed will double after a time :
Official answer
(3)
$\displaystyle \frac{\sqrt{3} \mathrm{~m} v_0}{\mathrm{qE}_0}$
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JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.