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One type of mass spectrometer accelerates ions of charge q, mass m, and initial speed zero...

One type of mass spectrometer accelerates ions of charge q, mass m, and initial speed zero through a potential difference ΔV. The ions then enter a magnetic field where they move in a circular path of radius r.

How is the mass of the ions related to these other quantities?

Express your answer in terms of the variables q, r, B, and ΔV.

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