A beam of electrons traveling with a speed of 3.0 × 107 m/s enters a uniform, downward electric field of magnitude 2.0 × 104 N/C between the deflection plates of an oscilloscope. The initial velocity of the electrons is perpendicular to the field. The plates are 6.0 cm long.
(a) What is the direction and magnitude of the change in velocity of the electrons while they are between the plates?
(b) How far are the electrons deflected in the ± y -direction while between the plates?

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6.0 cm Electric field