A proton and a deutron (q = +e, m = 2.0u) having same kinetic energies enter a region of uniform magnetic field \(\rm \vec{B}\), moving perpendicular to \(\rm \vec{B}\). The ratio of the radius rd of deutron path to the radius rp of the proton path is :
1
1 : 1
2
\(1 : \sqrt2\)
3
\(\sqrt2 : 1\)
4
1 : 2
5
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