Thanks.
In order to avoid the magnetic field lines' tendency to return to the other pole, I think I will work with a very long magnet to have the magnetic lines leaving the pole radially.
Thanks for taking the time to draw the magnetic lines in red. But I go back to my initial point and say you don't have any experimental proof that the lines actually go so deep in the iron plate, I think they enter the plate (if at all) very superficially, most of the lines just glide past the...
My whole point is that you have no experimental proof to support the belief that the magnetic field is uniform inside the sphere, indeed that it goes through the bulk at all.
Speaking about your example with the sphere, I was thinking about making myself a hemisphere of soft iron and stick the...
Ok, so it is clear to me that most of you (if not all) have a deep belief that the magnetic field lines pass through the bulk of iron, and that the magnetic field lines are not confined to a very thin layer at the iron surface.
Thanks very much for your answers, I will search more on this issue...
Hi, thanks for your comment.
I understand that the iron plate develops poles at the edges, but they are more to the magnet side and not to the rear side.
If iron was such a "high permeability" material for the magnetic field, it would develop poles at points A also (at the rear of the plate)...
It is the fact that the slab enhances that tendency (of lines to return) that bothers me. It just doesn't square well with the fact that iron has "high permeability". It looks more like iron "reflects" the lines than letting them pass on.
Back to the plate in front of a magnet, when a magnetic line coming from the pole of the magnet enters the iron plate perpendicularly, I don't see why it just doesn't go straight on, if iron has such a "high permeability" material. The line doesn't go straight but curves and goes through the...
Ok, I see the difference. But, I find it quite strange to call iron "high permeability" material and not to have a strong magnetic field on the back of an iron plate right opposite the pole of a magnet. Rather I suspect something similar with a superconductor might be taking place: lines enter...
Ok, but from the figure attached, it seems that the iron rather blocks the magnetic field than transmitting it. Hence probably iron shouldn't be described as having high "magnetic permeability", on the contrary, it has low "permeability" since it blocks the magnetic field. Compare it to a plate...
A big plate of iron placed in front of a bar magnet (plate area say 100 times that of the pole of a magnet) reduces the magnetic field behind it.
If the iron plate became highly magnetized in response to the field of the bar magnet, it wouldn't have this effect, the plate would develop an equal...