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20. A charged particle has a charge of q+2e and a mass of 4.00 u, where u is the atomic mass unit, with 1u 1.661x10-27 kg. Suppose the charged particle travels in a circular path of radius 4.50 cm in a uniform magnetic field with B1.20 T. Which of the following is TRUE? A) The particles speed is 1.30x105 m/s B) The period of revolution is 0.409 us. C) The particles kinetic energy is 0.140 MeV. D) The particle has constant acceleration. D) none of these

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2. v。Co.ou5 ) ( 2x1.EX[o-19) ( 661x (o 22 ( l. 2) 2.6 xIo6 -23 0.14o MeV

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