A proton, a deuteron, and an $\alpha$-particle are projected perpendicular to the direction of a uniform magnetic field with the same kinetic energy. The ratio of the radii of the circular paths described by them is

Question

1 : $\sqrt{2}$ : 1

1 : $\sqrt{2}$ : $\sqrt{2}$

$\sqrt{2}$ : 1 : 1

$\sqrt{2}$ : $\sqrt{2}$ : 1

Solution

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