A proton and an electron both moving with the same velocity $v$ enter into a region of magnetic field directed perpendicular to the velocity of the particles. They will now move in circular orbits such that
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(b) We know that time period $T = \frac{{2\pi m}}{{qB}}\,\,\,i.e.\;T \propto m$
(Since $q$ and $B$ are same)
Mass of proton $>$ Mass of electron
$\therefore $ Time period of proton $>$ Time period of electron
(Since $q$ and $B$ are same)
Mass of proton $>$ Mass of electron
$\therefore $ Time period of proton $>$ Time period of electron
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