using work energy theorem
e E d = 0.5 m v^2
1.6* 10^-19* E* 0.75* 10^-3 = 0.5* 16* 1.67* 10^-27* 2000^2
E = 445.33 N/C
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b)
V = Ed = 445.33* 0.75* 10^3
V = 0.334 V
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