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In Bainbridge mass spectrograph a potential difference of 1000 V is applied between two plates distant 1 cm apart and magnetic field in B = 1T. The velocity of undeflected positive ions in m/s from the velocity selector is

(a)107 m/s                     (b) 104 m/s
(c) 105 m/s                    (d) 102 m/s