Circular motion of charges: As shown in the figure, a small particle of charge q = - 7.0 10^ -6Cand mass m = 3.1 10^-12 kg has velocity v0 = 9.4 10^3 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=5.0cm. Calculate the magnitude and direction of the magnetic field in the region.

Region of magnetic field R - - Path of VO the particle - m