Magnetism - Magnetic materials

In physics, magnetism is one of the phenomena by which materials exert an attractive or repulsive force on other materials. Magnetism - Magnetic materials. Some well known materials that exhibit easily detectable magnetic properties are iron, some steels, and the mineral lodestone; however, all materials are influenced to one degree or another by the presence of a magnetic field, although in most cases the influence is too small to detect without special equipment.

Magnetism - Electromagnets. Electromagnets are useful in cases where a magnet must be switched on or off; for instance, large cranes to lift junked automobiles. For the case of electric current moving through a wire, the resulting field is directed according to the "right hand rule." If the right hand is used as a model, and the thumb of the right hand points along the wire from positive towards the negative side ("conventional current", the reverse of the direction of actual movement of electrons), then t ...

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Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles ., Magnetism - Magnetic monopoles ., Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units, Magnetism - Footnotes

Read more here: » Magnetism: Encyclopedia II - Magnetism - Types of magnets

Magnetism - Electromagnets. Electromagnets are useful in cases where a magnet must be switched on or off; for instance, large cranes to lift junked automobiles. For the case of electric current moving through a wire, the resulting field is directed according to the "right hand rule." If the right hand is used as a model, and the thumb of the right hand points along the wire from positive towards the negative side ("conventional current", the reverse of the direction of actual movement of electrons), then t ...

See also:

Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles, Magnetism - Magnetic monopoles, Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units

Read more here: » Magnetism: Encyclopedia II - Magnetism - Types of magnets

Contrary to normal experience, some theoretical physics models predict the existence of magnetic monopoles. Paul Dirac observed in 1931 that, because electricity and magnetism show a certain symmetry, just as quantum theory predicts that individual positive or negative electric charges can be observed without the opposing charge, isolated South or North magnetic poles should be observable. In practice, however, although charged particles like protons and electrons can be easily isolated as individual electrical charges, magnetic south and no ...

See also:

Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles ., Magnetism - Magnetic monopoles ., Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units, Magnetism - Footnotes

Read more here: » Magnetism: Encyclopedia II - Magnetism - Magnetic monopoles .

The physical cause of the magnetism of objects, as distinct from electrical currents, is the atomic magnetic dipole. Magnetic dipoles, or magnetic moments, result on the atomic scale from the two kinds of movement of electrons. The first is the orbital motion of the electron around the nucleus; this motion can be considered as a current loop, resulting in an orbital dipole magnetic moment along the axis of the nucleus. The second, much stronger, source of electronic magnetic moment is due to a quantum mechanical property called the spin dipole magnetic moment (although current quantum mechanical theory states that elect ...

See also:

Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles ., Magnetism - Magnetic monopoles ., Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units, Magnetism - Footnotes

Read more here: » Magnetism: Encyclopedia II - Magnetism - Atomic magnetic dipoles

When a charged particle moves through a magnetic field B, it feels a force F given by the cross product: where is the electric charge of the particle is the velocity vector of the particle is the magnetic field Because this is a cross product, the force is perpendicular to both the motion of the particle and the magnetic field. It follows that the magnetic force does no work on the particle; it may change the direction of the par ...

See also:

Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles, Magnetism - Magnetic monopoles, Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units

Read more here: » Magnetism: Encyclopedia II - Magnetism - Charged particle in a magnetic field

Normally, magnetic fields are seen as dipoles, having a "South pole" and a "North pole"; terms dating back to the use of magnets as compasses, interacting with the Earth's magnetic field to indicate North and South on the globe. A magnetic field contains energy, and physical systems stabilize into the configuration with the lowest energy. Therefore, when placed in a magnetic field, a magnetic dipole tends to align itself in opposed polarity to that field, thereby canceling the net field strength as much as possible and lowering ...

See also:

Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles ., Magnetism - Magnetic monopoles ., Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units, Magnetism - Footnotes

Read more here: » Magnetism: Encyclopedia II - Magnetism - Magnetic dipoles .

When a charged particle moves through a magnetic field B, it feels a force F given by the cross product: where is the electric charge of the particle is the velocity vector of the particle is the magnetic field Because this is a cross product, the force is perpendicular to both the motion of the particle and the magnetic field. It follows that the magnetic force does no work on the particle; it may change the direction of the par ...

See also:

Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles ., Magnetism - Magnetic monopoles ., Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units, Magnetism - Footnotes

Read more here: » Magnetism: Encyclopedia II - Magnetism - Charged particle in a magnetic field

Contrary to normal experience, some theoretical physics models predict the existence of magnetic monopoles. Paul Dirac observed in 1931 that, because electricity and magnetism show a certain symmetry, just as quantum theory predicts that individual positive or negative electric charges can be observed without the opposing charge, isolated South or North magnetic poles should be observable. In practice, however, although charged particles like protons and electrons can be easily isolated as individual electrical charges, magnetic south and no ...

See also:

Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles, Magnetism - Magnetic monopoles, Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units

Read more here: » Magnetism: Encyclopedia II - Magnetism - Magnetic monopoles

Normally, magnetic fields are seen as dipoles, having a "South pole" and a "North pole"; terms dating back to the use of magnets as compasses, interacting with the Earth's magnetic field to indicate North and South on the globe. A magnetic field contains energy, and physical systems stabilize into the configuration with the lowest energy. Therefore, when placed in a magnetic field, a magnetic dipole tends to align itself in opposed polarity to that field, thereby canceling the net field strength as much as possible and lowering ...

See also:

Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles, Magnetism - Magnetic monopoles, Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units

Read more here: » Magnetism: Encyclopedia II - Magnetism - Magnetic dipoles

The physical cause of the magnetism of objects, as distinct from electrical currents, is the atomic magnetic dipole. Magnetic dipoles, or magnetic moments, result on the atomic scale from the two kinds of movement of electrons. The first is the orbital motion of the electron around the nucleus; this motion can be considered as a current loop, resulting in an orbital dipole magnetic moment along the axis of the nucleus. The second, much stronger, source of electronic magnetic moment is due to a quantum mechanical property called the spin dipole magnetic moment (although current quantum mechanical theory states that elect ...

See also:

Magnetism, Magnetism - Magnetic materials, Magnetism - Physics of magnetism, Magnetism - Charged particle in a magnetic field, Magnetism - Magnetic dipoles, Magnetism - Magnetic monopoles, Magnetism - Atomic magnetic dipoles, Magnetism - Types of magnets, Magnetism - Electromagnets, Magnetism - Permanent Magnets, Magnetism - SI magnetism units, Magnetism - Other magnetism units

Read more here: » Magnetism: Encyclopedia II - Magnetism - Atomic magnetic dipoles