Two particles \( X \) and \( Y \) have charges \( q \) and \( 4 q \) respectively. After being a...

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Two particles \( X \) and \( Y \) have charges \( q \) and \( 4 q \) respectively. After being accelerated through the same potential difference, they enter a region of uniform magnetic field and describe circular paths of radii \( R \) and \( \frac{R}{2} \) respectively. The ratio of mass of \( X \) to that of \( Y \) is
(A) \( 2: 1 \)
(B) \( 1: 2 \)
(C) \( 1: 1 \)
(D) \( 1: 4 \)
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