1. Isotopes are separated by a mass spectrometer. Ions are accelerated through a potential difference and then allowed to pass through a velocity selector. The velocity selector is composed of a uniform 0.0400 T magnetic field and a uniform electric field perpendicular to each other. If the electric field is produced using parallel plates that are 1.50 cm apart, what is the potential difference between the plates that will permit singly charged ions with a speed of 4.20 x 105 m/s to pass undeflected through the selector? ( 2. Single charged ions pass undeflected through the velocity selector of a mass spectrometer. This velocity selector has a magnetic field of 0.250 T and an electric field of 7000 V/m perpendicular to each other. These ions then enter a separation region where the magnetic field is the same as in the velocity selector. If the radius of the deflected ions is 8.13 mm, what is the mass of each ion?