Physics · 2019
JEE Main · 8 April 2019, Shift 2 · Q15
A positive point charge is released from rest at a distance r_o from a positive line charge with uniform density. The speed (v) of the point charge,…
A positive point charge is released from rest at a distance $\displaystyle \mathrm{r}_{\mathrm{o}}$ from a positive line charge with uniform density. The speed (v) of the point charge, as a function of instantaneous distance r from line charge, is proportional to :
Official answer
(3)
$\displaystyle v \propto \sqrt{\ln \left(\frac{\mathrm{r}}{\mathrm{r}_{\mathrm{o}}}\right)}$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.