An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii $r_e,r_p$ and ${r_\alpha }$ respectively in a uniform magnetic field $B$. The relation between $r_e,r_p$ and $\;{r_\alpha }$ is
An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii $r_e,r_p$ and ${r_\alpha }$ respectively in a uniform magnetic field $B$. The relation between $r_e,r_p$ and $\;{r_\alpha }$ is
- [JEE MAIN 2018]
- A
$r_e < r_p$ $=$ $\;{r_\alpha }$
- B
$r_e < r_p$ $ <$ $\;{r_\alpha }$
- C
$r_e < $ $\;{r_\alpha }$ $< r_p$
- D
$r_e > r_p$ $=$ $\;{r_\alpha }$
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