A particle of mass 1.1122 × 10−25 kg and charge of 3.2×10−19 C is accelerated from rest in the plane of the page through a potential difference of 287 V between two parallel plates as shown. The particle is injected through a hole in the right-hand plate into a region of space containing a uniform magnetic field of magnitude 0.0711 T. The particle curves in a semicircular path and strikes a detector. Which way does the magnetic field point?