m Region of magnetic field R Path of the particle As shown in the figure, a small particle of charge q = -7.3 x10-6 C and mass m = 3.1x 10-12 kg has velocity vo = 9.4 x 103 m/s as it enters a region of uniform magnetic field. The particle is observed to travel in the semicircular path shown, with radius R = 5.0 cm. Calculate the magnitude and direction of the magnetic field in the region.