A proton, a deutron and an $$\alpha$$-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 :
- A1 : $$\sqrt 2 $$ : $$\sqrt 2 $$
- B1 : 1 : $$\sqrt 2 $$
- C$$\sqrt 2 $$ : 1 : 1
- D1 : $$\sqrt 2 $$ : 1
✓ Correct answer: D
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