Magnetism and Motion of Charged Particles (4C) Practice Test

A positively charged particle moves to the left through a uniform magnetic field directed upward (both in the plane of the page). No electric field is present. Based on the right-hand rule, the magnetic force on the particle points:

An electron enters a uniform magnetic field region and follows a circular path. If the electron’s charge were hypothetically changed to $+e$ while keeping the same mass, speed, and entry direction relative to $\vec B$, which change is most consistent with the observed trajectory?