Physics · 2014
JEE Main · 12 April 2014, Shift 1 · Q19
A positive charge ' q ' of mass ' m ' is moving along the +x axis. We wish to apply a uniform magnetic field B for time Δ t so that the charge…
A positive charge ' q ' of mass ' m ' is moving along the $\displaystyle +x$ axis. We wish to apply a uniform magnetic field B for time $\displaystyle \Delta \mathrm{t}$ so that the charge reverses its direction crossing the $\displaystyle y$ axis at a distance d. Then :
Official answer
(3)
$\displaystyle \mathrm{B}=\frac{2 \mathrm{~m} v}{\mathrm{qd}} \text { and } \Delta \mathrm{t}=\frac{\pi \mathrm{d}}{2 v}$
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JEE Main 2014 Physics question, with the answer from NTA’s final answer key. Where our answers come from.