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In the figure, a particle moves along a circle in a region of uniform magnetic field of magnitude B = 5.0 mT. The particle is either a proton or an electron (you must decide which). It experiences a magnetic force of magnitude 2.9 × 10-15 N. What are (a) the particle's speed, (b) the radius of the circle, and (c) the period of the motion?

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-В r= mulv且 2 Tr

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