Physics · 2019
JEE Main · 10 April 2019, Shift 1 · Q19
A proton, an electron, and a Helium nucleus, have the same energy. They are in circular orbits in a plane due to magnetic field perpendicular to the…
A proton, an electron, and a Helium nucleus, have the same energy. They are in circular orbits in a plane due to magnetic field perpendicular to the plane. Let $\displaystyle \mathbf{r}_{\mathbf{p}^{\prime}} \mathbf{r}_{\mathbf{e}}$ and $\displaystyle \mathbf{r}_{\mathrm{He}}$ be their respective radii, then,
Official answer
(4)
$\displaystyle \mathrm{r}_{\mathrm{e}}<\mathrm{r}_{\mathrm{p}}=\mathrm{r}_{\mathrm{He}}$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.