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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 ...
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.
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.
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. Field lines can be used as a ...
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).
The direction of magnetic field lines are streamlines represented by the alignment of iron filings sprinkled on paper placed above a bar magnet Potential-flow streamlines achieving the Kutta condition around a NACA airfoil with upper and lower streamtubes identified.
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.
Magnetism is the class of physical attributes that occur through a magnetic field, which allows objects to attract or repel each other.Because both electric currents and magnetic moments of elementary particles give rise to a magnetic field, magnetism is one of two aspects of electromagnetism.