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In an experiment with cosmic rays, a vertical beam of particles that...


 In an experiment with cosmic rays, a vertical beam of particles that have charge of magnitude e and mass 6 times the proton mass enters a uniform horizontal magnetic field of B-0.5T and is bent in semicircle of diameter 50cm as shown in Figure. 


Find a speed of the particles as they enter the field. in m/s, 2 significant figures.

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