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A proton, a deuteron and an α -particle with same kinetic energy enter into a uniform magnetic field at right angle to magnetic field. The ratio of the radii of their respective circular paths is :

1. 2 : 2 : 1
2. 2 : 1 : 1
3. 1 : 1 : 2
4. 1 : 2 : 1

Correct answer: 1 : 2 : 1

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