A particle (q) = -4.0 μC, m = 5.0 mg, moves in a uniform magnetic field with a velocity having a magnitude of 2.0 km/s and a direction that is 50° away from that of the magnetic field. The particle is observed to have acceleration with a magnitude of 5.8 m/s². What is the magnitude of the magnetic field?
a. 5.1 mT
b. 4.7 mT
c. 3.6 mT
d. 5.3 mT
e. 4.9 mT