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 154 v/m and the magnetic field is 3.18×10-2 t. the ions next enter a uniform magnetic field of magnitude 1.75×10-2 t that is oriented perpendicular to their velocity. a)how fast are the ions moving when they emerge from the velocity selector? v=/s b)if the radius of the path of the ions in the second magnetic field is 17.5 cm, what is their mass? m=