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A charge q = +929 ?C is uniformly distributed on a thin nonconducting ring of mass m = 0.60 g and radius r = 2.60 cm. The ring is suspended at rest by a frictionless bearing of negligible mass that allows it to rotate freely about its center, but constrains it to remain in the x-y plane. There is a magnetic field B = 0.50 T in the +z direction. At time t = 0, the magnetic field is shut off, and drops to zero. What is the final angular velocity of the ring?

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