Answer
(d) Both particles experience the same magnetic force, because the component of each velocity that is perpendicular to the magnetic field is the same
Work Step by Step
In general, if a charge moves at an angle $\theta$ with respect to the magnetic field, only the velocity component, $v\sin\theta$, which is perpendicular to the field, gives rise to a magnetic force and the component, $v\cos\theta$, which is parallel to the field yields no field. In the given diagram, the component of each velocity that is perpendicular to the magnetic field is the same. Therefore, both the particles experience the same magnetic force as they move in the magnetic field.
