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  4. A neutron, a proton, an electron and an α particle enter a region of uniform magnetic field with same velocities. The magnetic field is perpendicular and directed into the plane of the paper. The tracks of the particles are labeled in the figure. The electron follows the track <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-bznployl931toelf.jpg />

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Q. A neutron, a proton, an electron and an $\alpha $ particle enter a region of uniform magnetic field with same velocities. The magnetic field is perpendicular and directed into the plane of the paper. The tracks of the particles are labeled in the figure. The electron follows the track
Question

NTA AbhyasNTA Abhyas 2022

Solution:

$r=\frac{m v}{B q}$
$r$ is least when $\left(\frac{m}{q}\right)$ is least.
$\left(\frac{m}{q}\right)$ is least for electron ,so electron will trace path with minimumm radius i.e. track $D$