Question

if an electron is entering perpendicularly into a magnetic field ( North and South), which way will it go? into or out of the page?

Answer 1

which way is the electron moving?
which way is the magnetic field pointed?
use the right-hand rule, it's not too hard

Answer 2

http://www.youtube.com/watch?v=UWBNxUzsgts

Answer 3

Use the right hand rule to find the force , but notice that the electron have a negative charge , so it would be in the opposite direction ... if you know the force , you can know the direction , and because of the fact that the velocity is perpendicular to the magnetic field .. the electron will move in a circular motion ...