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Questions  

A proton of energy 8eV is moving in a circular path in a uniform magnetic field. The energy of an  α- particle moving in the same magnetic field and along the same path will be-

a
4eV
b
2eV
c
8eV
d
6eV

detailed solution

Correct option is C

r=mvqB=pqB=2mkqB                          p22m=k;    p=2mkIt r and B are samek∝qm                kpkα=q2q4mm=1                       kp=kα.

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