# For a mass spectrometer the magnetic field

###### Question:

For a mass spectrometer the magnetic field is varied to allow ions of varying mass to reach the detector. A different method would be to maintain a constant magneticfield and vary the accelerating potential difference of V. Assuming the magnetic field is held at B= .250T and that r= .0750 m in which of the following ranges ofvoltages could one detect both oxygen molecules (m=2.656 x 10^-26kg) and nitrogen molecules (m= 2.325 x 10^-26kg)

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