When a magnetic sector instrument was operated with an accelerating voltage of 4.00*103 v, a field of 0.136 t was required to focus the ch4+ on the detector. a) what range of field strengths would be required to can the mass range between 16.0 and 3.00*102 , for singly charged ion, if the accelerating voltage is held constant? b) what range of accelerating voltages would be required to scan the mass range between 16.0 and 3.00*102 , for singly charged ion, if the accelerating voltage is held constant?