PhysicsHard116×since 2002Q7742An electron, a proton and an alpha particle having the same kinetic energy are moving in circular orbits of radii r_e, r_p, rα_\alphaα respectively in a uniform magnetic field B. The relation between r_e, r_p, rα_\alphaα is:Ar_e < rα_\alphaα < r_pBr_e > r_p = rα_\alphaαCr_e < r_p = rα_\alphaαDr_e < r_p < rα_\alphaαCheck answerSkip