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Singly ionized (one electron removed) atoms are accelerated and then passed through a velocity selector consisting of perpendicular electric and magnetic fields. The electric field is 157 V/m and the magnetic field is 3.14×10-2 T. The ions next enter a uniform magnetic field of magnitude 1.77×10-2 T that is oriented perpendicular to their velocity.

a/ How fast are the ions moving when they emerge from the velocity selector?

b/ If the radius of the path of the ions in the second magnetic field is 17.3 cm, what is their mass?

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