22:1522:15, 20 June 2009diffhist+47
Field line
re-added mention of similarity to topographic lines. The analogy is better for topo lines than for latitude and longitude, but I left the lat-lon mention intact.
03:4603:46, 20 June 2009diffhist+690
Field line
The physical significance can be shown with gravitational field lines, in finding lagrange points for satellite orbital planning.
03:2803:28, 20 June 2009diffhist+114
Field line
minor clarification edit. they're lines in a 2d slice, but in 3d they're more like shells, or the layers of an onion.
03:1803:18, 20 June 2009diffhist+179
Field line
image description now makes clear that magnetif fields have no lines, and the lines in the photo are a product of the iron filings interacting with the magnetic field.
03:1303:13, 20 June 2009diffhist+749
Field line
Tried to clean this up a little so the crux of what a field line is, is not buried in mathematical jargon. Still more to do, but at least the beginning of article is clearer.
00:2200:22, 20 June 2009diffhist+19
Thousand-yard stare
Sharbat Gula's image was removed previously because of fair use concerns, so I added a link to the see also section, which is almost as informative.