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Two particles X and Y having equal charges are being accelerated through the same potential difference. Thereafter they enter normally in a region of uniform magnetic field and describes circular paths of radii R 1 and R 2 respectively. The mass ratio of X and Y is :

1. 2 2 1 R R ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛
2. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ 1 2 R R
3. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ 2 1 R R
4. 2 1 2 R R ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛

Correct answer: 2 2 1 R R ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛

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