As shown in the figure, a small particle of charge q = -7.0 × 10-6 C and mass m = 3.1 × 10-12 kg has velocity v0 = 9.4 × 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. 
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