A proton of energy \( 8 \mathrm{eV} \) is moving in a circular path in a uniform magnetic field....
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A proton of energy \( 8 \mathrm{eV} \) is moving in a circular path in a uniform magnetic field. The energy of an alpha particle moving in the same magnetic field and along the same path will be
(A) \( 4 \mathrm{eV} \)
(B) \( 2 \mathrm{eV} \)
(C) \( 8 \mathrm{eV} \)
(D) \( 6 \mathrm{eV} \)
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