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As the name suggests, iron filings can be obtained from metal working operations as the scrap material filed off larger iron and steel parts. [2] They are very often used in science demonstrations to show the direction of a magnetic field. Since iron is a ferromagnetic material, a magnetic field induces each particle to become a tiny bar magnet ...
For example, iron filings placed in a magnetic field form lines that correspond to "field lines". [note 5] Magnetic field "lines" are also visually displayed in polar auroras, in which plasma particle dipole interactions create visible streaks of light that line up with the local direction of Earth's magnetic field.
Iron filings used to show the magnetic field lines of a bar magnet. In the history of physics , the concept of fields had its origins in the 18th century in a mathematical formulation of Newton's law of universal gravitation , but it was seen as deficient as it implied action at a distance .
Iron filings that have oriented in the magnetic field produced by a bar magnet Detecting magnetic field with compass and with iron filings Main article: Magnetic field The magnetic flux density (also called magnetic B field or just magnetic field, usually denoted by B ) is a vector field .
A blacksmith holds a piece of red-hot iron in a north–south direction and hammers it as it cools. The magnetic field of the Earth aligns the domains, leaving the iron a weak magnet. Drawing of a medical treatment using magnetic brushes. Charles Jacque 1843, France.
The two magnetic poles are in close vicinity, which concentrates the field lines and creates a strong magnetic field. Magnetic fields of a horseshoe magnet visualized using iron filings. A horseshoe magnet is either a permanent magnet or an electromagnet made in the shape of a horseshoe (in other words, in a U-shape).
Magnetic field lines visualized using iron filings. When a piece of paper is sprinkled with iron filings and placed above a bar magnet, the filings align according to the direction of the magnetic field, forming arcs allowing viewers to clearly see the poles of the magnet and to see the magnetic field generated.
When randomly dropped (as with the shaker here), iron filings arrange themselves so as to approximately depict some magnetic field lines. The magnetic field is created by a permanent magnet underneath the glass surface. While field lines are a "mere" mathematical construction, in some circumstances they take on physical significance.
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