An electron with a speed of `2.60 xx 10^(8) cm//s` enters and electric field of magnitude `1.00 xx 10^(3)N//C`, travelling along a field in the direction that retards its motion. (a) How far will the electron travel in the field before stopping momentarily, and (b) how much time will have elapsed ? (c ) If the region containing the electric field is 8.00 mm long (too short for the electroc to stop within it),what fraction of the electrons initial energy will be lost in that region ?

Explanation

(a) `1.92 xx 10^(-2) m`, (b) 14.8 ns, (c ) 41.6%