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Physics · 2018
JEE Main 2018 · 2018-04-08 Offline · Q18
An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii r_e, r_p, r_α respectively in a…
An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii $\displaystyle \mathrm{r}_{\mathrm{e}}, \mathrm{r}_{\mathrm{p}}, \mathrm{r}_\alpha$ respectively in a uniform magnetic field B. The relation between $\displaystyle \mathrm{r}_{\mathrm{e}}, \mathrm{r}_{\mathrm{p}}, \mathrm{r}_\alpha$ is :
Official answer
(2)
$\displaystyle \mathrm{r}_{\mathrm{e}}<\mathrm{r}_{\mathrm{p}}=\mathrm{r}_\alpha$
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JEE Main 2018 Physics question, with the answer from NTA’s final answer key. Where our answers come from.