Physics

Problem

A proton, an electron, and a Helium nucleus have the same energy. They are in circular orbits in a plane due to a magnetic field perpendicular to the plane. Let

r_p

r_e

and

r_{He}

be their respective radii, then, a.

r_e > r_p = r_{He}

r_e < r_p = r_{He}

r_e < r_p < r_{He}

r_e > r_p > r_{He}

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