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 rp, re and rHe be their respective radii, then,

Engineering

Physics

Motion of Charged Particle in Uniform Magnetic Field

Question

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 r_p, r_e and r_He be their respective radii, then,

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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$r = \frac{mv}{qB} = \frac{\sqrt{2 mK}}{qB}$

r_He = r_p > r_e