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Some mass spectrometers use an electric field to give the incoming ions a certain known kinetic energy as they enter the magnetic field. Assume a magnetic field strength of 0.3 T.

(a) If a certain ion carries a charge of 30 uC, has a mass of 0.7 g, and possesses an initial kinetic energy of 1.5 × 10-7 J, what is the radius r of its circular path?

(b) What is the final kinetic energy of the ion just before it reaches the ion detector? Please show your work

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