Magnetic field rather than electric

[Buzzer]

Magnetic field rather than electric...

Ok here's my question.

Why are magnetic fields used to deflect an electron beam rather than electric fields in television screens?

I'd appreciate a substantial prod in the right direction.
Feel free to give the answer though.

 

[Galileo]

I thought electric fields were used although it seems both are (were) used in practice.
http://en.wikipedia.org/wiki/Cathode_ray_tube

 

[Buzzer]

Maybe, but that's what the question asks...

This is just a guess but is it to do with the voltage being harder to reverse in an electric field than the current is in a magnetic field?

 

[Buzzer]

I find it hard to believe that no one can help me.
Maybe I should've posted this somewhere else...