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Unformatted text preview: qE ) and magnetic force ( qvB ) in opposite directions The forces balance each other for particles with velocity v=E/B Mass Spectrometer Ions (charge +e ) accelerate through potential difference V . F m =F e F m >F e F m <F e Uniform B field (out of paper) Ions enter magnetic field ( B ) with velocity ( v ) perpendicular to B . Detector (located at 2r ) counts only ions with mass ( m ) given by = 2 2 1 mv eV = r v m eBv 2 V B er m 2 2 2 = Mass spectrum obtained by varying B...
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