A charged particle enters a uniform magnetic field and follows the circular path shown in the drawing.
(a) Is the particle positively or negatively charges? Why?
(b) Particle’s speed is 140 m/s, magnitude of magnetic field is 0.48 T, and radius of the path is 960 m. Particle charge has magnitude of 8.2 x 10-4 C. Determine the mass of particle
(a)
Based upon RHR-1, a positive charge would feel a force towards the right
Therefore, the particle is negatively charged
(b)
Magnetic force = centripetal force
qvb = mv2/r
m = rqvB/v2 = rqB/v
m = (960)(8.2 x 10-4)(.48)/140 = 0.0027 kg