Ap physics b question on magnetic fields and such?

[treehugger08]

The electrons in a beam are moving at 2.6 x 10^8 m/s in an electric field of 16000 N/C. What value must the magnetic field have if the electrons pass through the crossed fields undeflected? Answer in units of micro Teslas.

I don't get it =[ Little help please?

[Mr. Chill]

In order for the electrons to pass through undeflected, the electric and magnetic force must be equal to each other, but in opposite directions, hence they will cancel out and there will be no force.
Fe=Fb
eq=bqv*sin(theta)
e=bv
e = electric feild (given)
b = magnetic force
v = velocity (given)
sin(90) = 1