Circular Motion of Charges: A doubly charged ion with speed 6.9 × 106 m/s enters a uniform 0.80-T magnetic field, traveling perpendicular to the field. Once in the field, it moves in a circular arc of radius 30 cm. What is the mass of this ion? (e = 1.60 × 10-19 C)
A. 11 × 10-27 kg
B. 6.7 × 10-27 kg
C. 3.3 × 10-27 kg
D. 8.2 × 10-27 kg
Answer: A
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