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4. What is the trajectory of an electron as it passes through the region of uniform electric field? 1 1. A proton of mass 1.67 x 10-27kg and charge +1.60 x 10-19C is placed in a uniform field of 2.5 x 103 N/C. What is the proton's acceleration? 12. An electron is placed in a uniform field of 4 x 103 N/C. What is the electron's speed after 2 us in the field if it started from rest