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An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 10 ⁷ m/s. What is the radius of the circle? ( e = 1.60 × 10 ^-19 C, m _electron = 9.11 × 10 ^-31kg)

a. 3.9 mm

b. 2.2 mm

c. 0.39 mm

d. 1.5 mm

e. 0.22 mm

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