Homework Help: Speed of electron into electric/magnetic fields

1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution

attached is my attempt to answer part b) of this question. I have been told its wrong but don't know what i'm missing, any ideas?

 

sorry the image didn't show up like planned i'll type it out.

b) Calculate the speed of the electron moving into the electric and magnetic fields....

we have a diagram in part a) that shows an electron moving into the plane of the page.

were given:
V = 2000 V between charged plates
d= 0.080 m between charged plates
B = 0.0028 T

The electron enters the electric field, which is perpendicular to the magnetic field, and passes through both fields undeflected.


Here now is my attempt at an answer.

V=2000 V
d= 0.080 m
B = 0.0028 T
q = 1.60 x 10^-19 C

E = F/d E = 2000 V / 0.080 m = 25000 V/m

F= Bqvelocity

F= Eq
(25000V/m)(1.60 x 10^-19)
= 4 x 10^-15 N