Here"s a map that the barometric push in the joined States.
You are watching: How can iron filings be used to map the magnetic field of a bar magnet?
The map consists of isobars, which room lines of continuous pressure. These are created by starting from an arbitrarily point, and following the direction wherein the push doesn"t change.
Isobars don"t "exist", in the feeling that there isn"t literally a huge white heat in the sky hovering over new York City at this moment. Isobars aren"t do of anything, and whether or no an isobar goes v a suggest on a map is determined entirely by how the map device decided to draw them. But they aid you visualize pressure, i m sorry is very real.
When civilization say the magnetic ar lines don"t "exist", they mean they"re like isobars: a fully arbitrary visualization tool that doesn"t exist external of diagrams. However like pressure, the magnetic ar itself is as real as it gets. Steel filings follow its direction.
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answered Feb 9 "20 in ~ 8:20
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Individual iron filings will align their long measurement with the magnetic field. But then lock will likewise feel the induced magnetization in various other iron corpuscle nearby, and they will tend to relocate toward each other till your points touch.
This is what creates the strings of iron particles. Once the needles cannot relocate from their site, one go not get lines.
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edited Feb 9 "20 at 9:52
reply Feb 9 "20 at 9:43
GuruVishnu No, in the van Allen belts over there is no interaction between the particles. Iron filings contribute to the field by alignment, by clustering. The corpuscle will move to areas with a strong field and also a solid gradient, for example to the reminder of a string of other iron particles. $\endgroup$
Feb 9 "20 in ~ 10:49
user6760 You space the OP therefore this is around the stole filings, no about cost-free electrons in space. Steel particles communicate with each various other by the dipole fields of their magnetizations. Each filing will frequently contain a number of domains. Those internal domain walls relocate in response to the outside field i beg your pardon gives rise in their magnetic moment. And then the particle might move (if over there is friction as once they lie on paper) or lock will move when in a fluid. $\endgroup$
Feb 9 "20 at 12:09
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That go look choose there are real lines, doesn"t it?
It"s because each iron submit becomes its own magnet i m sorry affects the others.
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Notice exactly how they"re all crowded with each other close come the end of the magnet, and also then there"s a an ar where they"re thin, and then they get closer together farther away?
I think that"s due to the fact that close up, the magnetic ar of the bar magnet is very solid and is the most vital thing. But a little distance from there, the steel filings room each strong magnets and they defeat each other to the political parties while they strongly attract each various other at their ends. If you might cut the bar magnet in fifty percent the long means without making sufficient heat to ruin its magnetic fields, the halves would certainly spring apart since they repel every other. The steel magnet stop itself with each other too strongly to let the happen. Yet if you cut it in fifty percent the brief way, the two halves would cling to every other.
Farther far the iron filing magnets room weaker and also so castle don"t defeat each other as much and the lines acquire closer.