Deflection due to Magnetic Field

[Alouette]

Homework Statement

The deflection of the electron beam in an old-fashioned tube TV set is accomplished by magnetic forces. Each electron is accelerated through a potential difference of V=30000V. The charge to mass ratio of the electron is 175824175824.176C/kg.

If there is a x₂=0.1m gap between the end of the magnetic field region and the end of the tube, how far from the center of the screen does the beam strike?

ynet = y1 + y2 =

Homework Equations

R = mv/qB

R = (m/eB)*√(2eV_acc/m)

The Attempt at a Solution

I'm not even sure where to begin. The first thing I'm confused by is what do they mean by end of magnetic field region?

 

[lonely1001]

Im having the same problem as above with the same question.
it just that the question above seem to be missing a line of information which is
What magnetic field is required to produce a deflection of y1=0.03m if the magnetic field region is x1=0.065m long?