In a mass spectrometer, a specific velocity can be selected from a distribution by injecting charged particles between a set of plates with a constant electric field between them and a magnetic field across them (perpendicular to the direction of particle travel). if the fields are tuned exactly right, only particles of a specific velocity will pass through this region undeflected. consider such a velocity selector in a mass spectrometer with a 0.115 t magnetic field. a. what electric field strength, in volts per mater, is needed to select a speed of 3.7 x 10^6 m/s? b. what is the voltage, in kilovolts, between the plates if they are separeted by 0.75 cm?