JEE MAIN - Physics (2019 - 10th April Morning Slot - No. 1)
A proton, an electron, and a Helium nucleus,
have the same energy. They are in circular
orbits in a plane due to magnetic field
perpendicualr to the plane. Let rp, re and rHe be
their respective radii, then
re < rp < rHe
re < rp = rHe
re > rp > rHe
re > rp = rHe
Explanation
$$r = {{mv} \over {qB}} = {{\sqrt {2mK} } \over {qB}}$$
$${r_{He}} = {r_p} > {r_e}$$
$${r_{He}} = {r_p} > {r_e}$$
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