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A beam of ions, each of charge +1, passes through a velocity selector and emerges with...

A beam of ions, each of charge +1, passes through a velocity selector and emerges with a velocity of 4920 m/s. The beam then enters a mass spectrometer with a field strength of 0.0175 T. The radius of the ions is 17.5cm. What is the mass of one ion? Let the charge on a proton q = 1.6 x 10^-19 C.

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the radius of ion in circular motionR in magnetic field in spectrometer B-0.0175T velocity of ions v-4920- charge on each ion

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