Question

Particle A with charge q and mass ma and particle B with charge 2q and mass

mb, are accelerated from rest by a potential difference AV and subsequently
deflected by a uniform magnetic field into semicircular paths. The radii of the
trajectories by particle A and B are R and 3R, respectively. The direction of
the magnetic field is perpendicular to the velocity of the particle. Determine
their mass ratio?
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Answer 1

Particle A with charge q and mass ma and particle B with charge 2q and mass mb, are accelerated from rest by a potential difference AV and subsequently deflected by a uniform magnetic field into semicircular paths. ... The direction of the magnetic field is perpendicular to the velocity of the particle.