A charged particle enters a uniform magnetic field and follows the circular path shown in the drawing.
(a) Is the particle positively or negatively charged? Why?
(b) The particle's speed is 140 m/s, the magnitude of the magnetic field is 0.48 T, and the radius of the path is 960 m. Determine the mass of the particle, given that its charge has a magnitude of 8.2 × 10-4 C.

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B (out of paper)