Question: An electron and a proton move in circular orbits in a plane perpendicular to a uniform magnetic field B(vector). Find the ratio of the radii

An electron and a proton move in circular orbits in a plane perpendicular to a uniform magnetic field B(vector). Find the ratio of the radii of their circular orbits when the electron and the proton have

(a) The same momentum

(b) The same kinetic energy.

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