A mass spectrometer is constructed using a velocity selector feeding a chamber of uniform magnetic field, B_ch. The velocity selector is itself constructed using a parallel plate capacitor in a uniform magnetic field, B_in. The electric field in the selector is 7.10 kV/m and the magnetic field is B_in=8.10T. The mass of the ions passing through the exit slit can be found by measuring the distance between the entrance and exit slits. The magnetic field in the circular motion chamber is B_ch=6.33T. What is the radius (in mm) for an ion of mass 6.61e-26 kg and a charge of +e (1.6e-19C)?

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