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 0.095 t magnetic field. part (a) what electric field strength, in volts per meter, is needed to select a speed of 41 106 ms? 50% part (b) what is the voltage, in kilovolts, between the plates if they are separated by 0.75 cm?