One in the fans of my fan ovens in the cooker and the other in the mains input filter to the washing machine.I stumbled on the Fieldline 7 pocket gas tank bag over in the ATV/Motorcycle area of my local WalMart store. I am dealing with two domestic emergencies (a result of crappy electrical design) at this moment. I meant to add these into my sketch this morning but, ![]() I was trying to show that there is a net balance of forces on the particles from repulsion from those on either side in 2D and above/below in 3D. Remember also that the magnetism in the filings is induced, not permanent. Why is that so?įair question but think about a balance of competing forces. So in my mind distances between lines would be big close to the magnet and small farther away but it's not the case as we can see in the original post. Good point but here's a question: if magnetic field is stronger closer to the magnet creating it, and becomes weaker further away then I would expect that repulsion between metal particles in adjacent lines to be the highest closer to the magnet and to weaken gradually as you move away. This ignores the concept that Studiot explained, so I am my argument exist hypothetically in a world where those like pole repultions don't occur Edited Maby CasualKilla So my reasoning is the field will always be stronger nearer to the blob and thus filing will want to be closer rather than further from it. I think you may be misunderstanding how shielding works. Ok yeah, the magnetic field in the air is definitely weaker than through the filings, but if we consider that just a single line of filings exists, I do not think we would see the field being weak just outside the 'ring' of filing then suddenly becoming stronger. But if you looked at thin shells of material in a field, it's quite dramatic how strong the field is inside the high-permeability material vs outside of it. If my modeling software weren't so out of day this would be fun to look at. However, I do agree with the idea that the filings effectively reduce the field in the vicinity - the flux will preferentially be found in the filings rather than the air.Īnd even so, separate filing won't necessarily behave the same as a solid mass, where you have additional bonds holding the material together. Thus, there's no reason for it for this proposed blob to form. Unless you have enough material to contain the entire flux without saturating, there will continue to be a field far from the magnet. ![]() No, I'm not saying the field is created that way - the field already exists. If you were to plot some lines at right angles to the chains you would find repulsive (N-N and S-S) forces in action, which is why you get spread out lines rather than a block in the middle.Īre you proposing that an interior line of filings will shield the area directly outside it (resulting in gaps with no filings), but the field will then becomes stronger again as you move outwards until it is strong enough to create another line of filing which will repeat the loop? So the system can rearrange itself when fine particles are introduced.Īnd yes, indeed there are few lines in the spaces and a concentration of lines in the chains of ferrous particles. Just as with a transformer or motor core, the field lines (want to) congregate in a ferrous material ie they are drawn into it, leaving few lines in the free space not occupied by the ferrous material.īut these paths have to be continuous through the core.Ĭores are not free to move, fine particles are. Without the filings the magnetic lines are 'evenly' distributed in space with no gaps.Įven is not exactly right since obviously the field strength diminishes with distance from the pole to pole centreline, but I think you know what I mean. Well this is a good example of a system seeking to minimise its energy. As imatfaal says the iron particles line up so they are touching as continuous chains of tine induced magnets.
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