4. In the figure, a small particle of charge -B x 10-6 C and mass m= D x 10-¹¹ kg has speed Vo=B x 10² m/s as it enters a region of uniform magnetic field. The particle is initially traveling perpendicular to the magnetic field and is observed to travel in the semicircular path shown with radius R = C/100 cm. Find the magnitude and direction of the magnetic field in the region. Da Region of magnetic field Path of the particle
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A = 60 B = 70 C = 170 D = 7
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