If a proton, deuteron and \( \alpha \)-particle on being accelerated by the same potential diffe...

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If a proton, deuteron and \( \alpha \)-particle on being accelerated by the same potential difference enters perpendicular to the magnetic field, then the ratio of their kinetic energies is
(a) \( 1: 2: 2 \)
(b) \( 2: 2: 1 \)
(c) \( 1: 2: 1 \)
(d) \( 1: 1: 2 \)
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