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 :

Question

1 : $\sqrt 2 $ : $\sqrt 2 $

1 : 1 : $\sqrt 2 $

$\sqrt 2 $ : 1 : 1

1 : $\sqrt 2 $ : 1

Solution

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