Why i have forces vectors up and down

[electron2]

http://i32.tinypic.com/rclu8z.gif

they are supposed to be inide and outside the page

come come they go to be up and down?

(you can left click in order to zoom)

 

[berkeman]

http://i32.tinypic.com/rclu8z.gif

they are supposed to be inide and outside the page

come come they go to be up and down


?

(you can left click in order to zoom)

The forces on the moving charges in the wires will be orthogonal to both the B-field direction and the direction of the motion of the charges. Hence, the forces have to be up and down in that diagram, since both B and the current directions lie in the plane of the page.

Use the equation F = q v X B to help you get a feel for the directions involved. Use the right-hand rule for that cross product in order to get the correct force direction. Does that make sense now?