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###### A proton and an electron enter a uniform magnetic field. The velocity vector of each particle...

A proton and an electron enter a uniform magnetic field. The velocity vector of each particle is perpendicular to the magnetic field. If their circular orbits have the same radii, what is the ratio of their speeds (Velectron/Vproton)? 5.5E-4 0.5 1.0 4.0 1800

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