An electron with a speed of 7.00 108 cm/s enters an electric field of magnitude 1.00 multiplied by 103 N/C, traveling along the field in the direction that retards its motion.
(a) How far will the electron travel in the field before stopping momentarily?
(b) How much time will have elapsed?
(c) If, instead, the region of electric field is only 1.00 mm long (too small for the electron to stop), what percentage of the electron's initial kinetic energy will be lost in that region?