Electron through electric and magnetic field

[Alb]

Homework Statement

An electron, initially at rest, is accelerated by a potential V in a vacuum and
then travels horizontally in a region of space where there is an electric field,
E, and a magnetic field, B. The fields are aligned such that the electron
is subjected to a force eE upwards and a force evB downwards, where e
is the charge of the electron and v is its velocity. If E = 1000 V/m and
B = 1 × 10^(-5) T, what is the value of the initial accelerating voltage V for
the electron to continue flying undeflected?
(Take m=10^(-30) kg and e=1.6×10^(-19) C)

Homework Equations

No idea.

The Attempt at a Solution

No idea.

 

[dawn_pingpong]

some equations for you:

upward F=qE
downward F=Bqv

(travelling straight so upward F=downward F)

Then, regarding voltage:

V=E/q=(0.5mv^2)/q

can you find the voltage from these equations?