An electron traveling horizontally with velocity 1.55 x10^{5} m/s enters a region where a uniform magnetic field is directed into the plane of the paper as shown. The electron has a mass of 9.11 x10^{-31} kg and a charge of -1.60 x10^{-19} C. The particle then enters a uniform 1.60-T magnetic field. If the particle's velocity is perpendicular to the magnetic feild at all times.

a). Describe and sketch the motion of the electron once it has entered the field on the paper. Identify the direction of the force acting over the electron.

b). What is the magnitude of the magnetic force exerted on the particle?