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An alpha particle (nucleus of a helium atom) consists of two protons and two neutrons and has a mass of 6.64x 10^ -27 kg. A horizontal beam of alpha particles is injected with a speed of 1.3 x 10^5 m/s into a region with a vertical magnetic field of magnitude .155 T . How long does it take for an alpha particle to move halfway through a complete circle?

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