A proton, an electron, and a Helium nucleus, have the same energy. They are in circular orbitals in a plane due to magnetic field perpendicular to the plane. Let $r_p, r_e$ and $r_{He}$ be their respective radii, then
JEE MAIN 2019, Medium
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$r=\frac{m v}{q B}=\frac{\sqrt{2 m K}}{q B}$
$r_{\mathrm{He}}=r_{p}>r_{e}$
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