Electrons accelerated between two plates

[thegroovyguru]

Homework Statement

Electrons are accelerated between points A and B to the energy of 7.1keV, see attachment. The coordinate system was selected to have the origin at the startup point A. The electrons enter an area between two parallel plates where the magnetic field is established by running a current through the coils. It has magnitude of 0.004T and pointed in the direction of the y axis. After making a quarter of a circle, they reach a certain point K in between the plates. Report the coordinates x,y and z (in centimetres) of the point K.

I'm not sure what to do beyond what I've done already...

Homework Equations

F=qVBsin(t)
F=q(vXB)
r=(mv/qB)
KE=1/2mv^2

The Attempt at a Solution

KE=1/2mv^2
v=sqrt((2(1.135x*10^-15)/9.1*10^-31)
v=5*10^7 m/s

F=Bqv
F=.004(1.602*10^-19)5*10^7
F=3.2*10^-14 N

 

[Brmax]

u must go to u of s hahah and your an idiot your going against the engineering ethics code
-Blake B

 

[thegroovyguru]

really dough brain? how is this different than you and your friends getting together to work on assignments?