electron moves along the field lines in a homogeneous electric field E = 200 V /

Question

electron moves along the field lines in a homogeneous electric field E = 200 V / m. inizial speed is 800 km/h.How much time passed until electron loses velocity and how long this movement last from the time he enters in field electron moves along the field lines in a homogeneous electric field E = 200 V / m. inizial speed is 800 km/h.How much time passed until electron loses velocity and how long this movement last from the time he enters in field electron moves along the field lines in a homogeneous electric field E = 200 V / m. inizial speed is 800 km/h.How much time passed until electron loses velocity and how long this movement last from the time he enters in field

Explanation / Answer

electron mass m = 9.1*10^-31 kg

charge of electron q = -1.6*10^-19 c

F = ma = -qE

9.1*10^-31*a = - 1.6*10^-19*200

a = - 3.52*10^13 m/s^2

u = 800 km/h = 222.22 m/s, v = 0

v = u +at

0 = 222.22 -3.52*10^13*t

t = 6.3*10^-12 s

v^2 - u^2 = 2as

0 -222.22^2 = -2*3.52*10^13*s

s = 7.01*10^-10 m

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