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In the operating room, anesthesiologists use mass spectrometers to monitor the respiratory gases of patients undergoing surgery. One gas that is often monitored is the anesthetic isoflurane (molecular mass = 3.06 10-25 kg). In a spectrometer, a singly ionized molecule of isoflurane (charge = +e) moves at a speed of 4.20 103 m/s on a circular path that has a radius of 0.035 m. What is the magnitude of the magnetic field that the spectrometer uses?

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