Questions  

A proton and an alpha particle both enter a region of uniform magnetic field, B, moving at

   right angles to the field B. If the radius of circular orbits for both the particles is equal and the

     kinetic energy acquired by proton is 1MeV, the energy acquired by the alpha particle will be

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a
1 MeV
b
4 MeV
c
0.5 MeV
d
1.5 MeV

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detailed solution

Correct option is A

R=mvqB=2mKqB Rα=Rp4mαkaqα2B2=4mpKpqp2B2 =4mpkα4e2=mp1MeVe2Kα=1MeV

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