A particle (q = ?4.0 ?C, 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 an acceleration with a magnitude of 5.8 m/s2. What is the magnitude of the magnetic field?
A. 5.3 mT
B. 4.9 mT
C. 5.1 mT
D. 4.7 mT
E. 3.6 mT
Answer: D
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