When we consider a magnet, usually we perceive the field lines to come out of the north pole. But since the poles of a magnet is actually just a man-defined thing, so actually the magnetic field doesn't emerge from the north but it's a constant loop. So when i draw the magnetic field of a bar magnet in this position, instinctively i will draw it like this: http://postimage.org/image/yzybv7vrl/full/ [Broken] However if i invert my magnet then i would draw it like this:http://postimage.org/image/sh5ksynwt/full/ [Broken] So if i take the north pole to be where the magnetic field emerges from, then the two magnetic field diagrams would be different but in actuality the second image should look similar to the first. Thus, from this i'm confused about how i should draw my magnetic field diagram. Are there any guidelines so that i will draw the correct ones? Thanks for the help!