Which way do magnetic field lines go through a coil?

[PPonte]

Magnetic Field Lines Question

http://img101.imageshack.us/img101/9819/coil2sm.jpg

Could someone tell me which is the direction of these magnetic field lines and why?

 

[Hootenanny]

Use flemming's left hand rule http://www.le.ac.uk/se/centres/sci/selfstudy/mam12.htm
In this case ingorre the thumb for force. Really 'handy' especially in an exam.

 

[PPonte]

Thank you. This rule is very useful.