A proton, a deuteron and an \( \alpha \)-particle are moving with same momentum in a uniform mag...

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A proton, a deuteron and an \( \alpha \)-particle are moving with same momentum in a uniform magnetic field. The ratio of magnetic forces acting on them is and their speed is , in the ratio.
(a) \( 4: 2: 1 \) and \( 2: 1: 1 \)
(b) \( 2: 1: 1 \) and \( 4: 2: 1 \)
(c) \( 1: 2: 4 \) and \( 1: 1: 2 \)
(d) \( 1: 2: 4 \) and \( 2: 1: 1 \)
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