magnet

Definitions

  • Claw-Hammer.  Riveting-Hammer.  Upholster's Hammer.  Magnetized Hammer.  Veneering-Hammer
    Claw-Hammer. Riveting-Hammer. Upholster's Hammer. Magnetized Hammer. Veneering-Hammer
  • WordNet 3.6
    • n magnet (physics) a device that attracts iron and produces a magnetic field
    • n magnet a characteristic that provides pleasure and attracts "flowers are an attractor for bees"
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Additional illustrations & photos:

Intensity magnet Intensity magnet
Two electro-magnets Two electro-magnets
Magnetic concentrating installation Magnetic concentrating installation
Magnetic concentrator Magnetic concentrator

Webster's Revised Unabridged Dictionary
  • Interesting fact: Earth's magnetic field has been weakening. It seems to have lost 15% of its strength since 1670. At the present rate of decrease, it will reach zero in 2,000 years. Between the years 3500 and 4500, the magnetic field will not be sufficiently strong enough to ward off charged radiation from outer space.
    • Magnet (Physics) A bar or mass of steel or iron to which the peculiar properties of the loadstone have been imparted; -- called, in distinction from the loadstone, an artificial magnet.
    • Magnet The loadstone; a species of iron ore (the ferrosoferric or magnetic ore, Fe3O4) which has the property of attracting iron and some of its ores, and, when freely suspended, of pointing to the poles; -- called also natural magnet. "Dinocrates began to make the arched roof of the temple of Arsinoë all of magnet , or this loadstone.""Two magnets , heaven and earth, allure to bliss,
      The larger loadstone that, the nearer this."
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Century Dictionary and Cyclopedia
  • Interesting fact: Every eleven years the magnetic poles of the sun switch. This cycle is called "Solarmax".
    • n magnet A body which possesses the property of attracting fragments of iron or steel, and which, when freely suspended, tends, under the action of the earth, to take a certain definite position, pointing approximately north and south. The lodestone, a variety of the mineral magnetite, or the native magnetic oxid of iron (Fe304), is a natural magnet; but the properties of the magnet are best shown by an artificial magnet (see below), which has commonly the form of a straight bar or that of a horseshoe. When a bar-magnet is dipped into iron-filings. it is found that they adhere most strongly at the extremities of the bar (which are called the poles of the magnet), and not at all along the line midway between them. Strictly speaking, however, except in the case of a long thin magnet, the poles are not exactly at the ends. The middle line is called the neutral line or equator of the magnet; the straight line joining the poles is the axis of the magnet, or magnetic axis. A magnetic bar may abnormally have one or more intermediate points of maximum attraction, which are then called consequent poles. Again, if a magnetic needle is suspended at its center of gravity so as to be entirely free to turn, it is found that in general it places itself with its axis in a direction nearly north and south, and with one end inclining downward. The pole which is directed toward the north is called the north or north-seeking pole, also the boreal, positive, or red pole, or marked end of the needle; the other, the south, south-seeking, austral, negative, or blue pole, or unmarked end. It is found, further, that the like poles of two magnets repel and unlike poles attract each other. If a magnet is broken into halves, each half is found to be a complete magnet with a north and a south pole; and this is true no matter how often the process of division is repeated. On this and other more fundamental grounds, it is concluded that the magnetic polarity belongs to each molecule throughout the bar, and the maximum attraction observed near the ends is only the resultant effect of all these individual forces. (See magnetism.) A magnetic substance is one which may be attracted by a magnet, but has not the property of attracting other magnetic substances, and therefore has no polarity. Soft iron is a magnetic substance, as is also most magnetite, the lodestone variety being exceptional. A permanent magnet is one which retains its magnetism after the magnetizing influences (see below) cease to act. Steel and the lodestone have this property, on account of their high degree of coerciveforce. (See coercive.) Soft iron has very little coercive force, and accordingly its power of retaining magnetism is small. An artificial magnet (as a compass-needle)is made by contact with other magnets, and the methods employed are described as single-touch, double-touch, and separate-touch, according to the way in which the substance to be magnetized is rubbed by the magnets. Such a magnet may also be made by magnetic induction without actual contact. (See induction, 6.) Again, a magnet may be made by passing a current of electricity through a wire wound about the bar to be magnetized; this is called an electromagnet (which see). By this means magnets of very great strength may be made. They have usually a horseshoe form, and the bar is of soft iron, so that it retains its magnetism only so long as the current is passing. The earth may be considered as a huge magnet, whose poles are situated in the neighborhood of the geographical poles, though not coinciding with them; the north magnetic pole of the earth corresponds in polarity to the south-seeking pole of a magnetic needle. The action of the earth causes a freely suspended needle to set in a plane called the magnetic meridian, which in general makes an angle east or west of the geographical meridian (see declination), and with one pole (in the northern hemisphere, the north-seeking pole) inclined downward (see dip of the needle, under dip). The earth's magnetic force also serves to induce magnetism in masses of iron lying in or near the magnetic meridian. An iron ship is thus magnetized in the course of its construction. Similarly, iron columns, etc., are often found to be feebly magnetic. Magnetic properties belong also to some other compounds of iron besides the magnetic oxid, as pyrrhotite or magnetic pyrites (Fe7S8), and to some varieties of the native sesquioxid, hematite (Fe2O3); also to the magnetic metals nickel, cobalt, chromium, and manganese. Some varieties of platinum are strongly magnetic. and occasionally masses have polarity also, but this may be due to the large percentage of iron present, although all so-called iron-platinum does not show this property. Finally, it is found that a powerful electromagnet exerts an effect on all substances, in accordance with which they are divided into the two groups paramagnetic and diamagnetic (this is explained under diamagnetism).
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Chambers's Twentieth Century Dictionary
  • Interesting fact: Public telephones in Israel are no longer operated by tokens as they were in the past. They are now operated by magnetic cards known in Hebrew as a telecart (tel-eh-cart). These plastic cards, the same size and shape as a credit card, are available at post offices, some hotel reception desks, street kiosks and dispensing machines.
    • n Magnet mag′net the lodestone, an iron ore which attracts iron, and, when hung so that it can move freely, points to the poles: a bar or piece of steel to which the properties of the lodestone have been imparted
    • v.i Magnet to become magnetic
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Quotations

  • Bruce Barton
    Bruce%20Barton
    “The essential element in personal magnetism is a consuming sincerity -- an overwhelming faith in the importance of the work one has to do.”
  • Joseph Cook
    Joseph Cook
    “Conscience is our magnetic compass; reason our chart.”
  • Gutzkow
    Gutzkow
    “Oh, how powerfully the magnet of illusion attracts.”

Etymology

Webster's Revised Unabridged Dictionary
OE. magnete, OF. magnete, L. magnes, -etis, Gr. Magnh^tis li`qos a magnet, metal that looked like silver, prop., Magnesian stone, fr. Gr. Magnhsi`a, a country in Thessaly. Cf. Magnesia Manganese

Usage

In literature:

The arrow with but half a barb points toward what is known as the Magnetic Pole of the earth, and is called the Magnetic Meridian.
"Manual of Military Training" by James A. Moss
As the magnet to soft iron, so is such a person to the desire-form, and it is attracted to him.
"Esoteric Christianity, or The Lesser Mysteries" by Annie Besant
There is no doubt that the magnetism of the earth has a polar distribution.
"The Faith Doctor" by Edward Eggleston
People are often surprised at seeing a piece of iron drawn to a magnet.
"The Story of the Heavens" by Robert Stawell Ball
As stated before, Deviation causes an error in the Compass due to the magnetism of the iron in the ship.
"Lectures in Navigation" by Ernest Gallaudet Draper
Magnetism is surely one of the most enviable possessions of the successful pianist.
"Great Pianists on Piano Playing" by James Francis Cooke
Some object every person wears or carries is made of iron or some other magnetic metal.
"Empire" by Clifford Donald Simak
Every nerve in his body leaped to meet the magnetism of her beautiful eyes.
"Astounding Stories of Super-Science February 1930" by Various
It is her money that is the magnet, and ah, the power makes itself felt!
"The Lightning Conductor Discovers America" by C. N. (Charles Norris) Williamson and A. M. (Alice Muriel) Williamson
Aiming well ahead of her, to allow for her motion, Thad pressed the key that hurled the magnet from the helix.
"Salvage in Space" by John Stewart Williamson
There was the source of that powerful magnetic ray!
"The Floating Island of Madness" by Jason Kirby
Cemented to the magnet was a tiny mirror.
"Astounding Stories of Super-Science, March 1930" by Various
Now we have found the explanation in the fact that the earth is a great big magnet.
"Common Science" by Carleton W. Washburne
Magnetism in Professional Life.
"Sex=The Unknown Quantity" by Ali Nomad
As though drawn by a magnet Alan turned to watch it.
"Astounding Stories, March, 1931" by Various
In this case he was using hollow magnets placed at known angles to each other.
"Astounding Stories of Super-Science January 1931" by Various
If I draw the knife blade across the magnet a few times, it receives this magnetic power from the magnet.
"With the Children on Sunday" by Sylvanus Stall
The repelling force of the lower magnet cushioned the fall, and the upper magnet took hold, hard.
"The Legion of Lazarus" by Edmond Hamilton
He will, no doubt, say it will; in which case, you place it over the end of the magnet, and it will presently stop.
"Endless Amusement" by Unknown
In R. F. is reduced to the metal and is magnetic.
"The Elements of Blowpipe Analysis" by Frederick Hutton Getman
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In poetry:

This is that hill of awe
That Persian Sindbad saw,--
The mount magnetic;
And on its seaward face,
Scattered along its base,
The wrecks prophetic.
"Lone Mountain" by Francis Bret Harte
What charm dwells in thine eye of blue,
That thus, by its magnetic pow'r,
The world to me hath brighter hue,
And happier grows each passing hour?
"A Swain To His Sweetheart" by Thomas Frederick Young
CHRYSANTHUS.
Stay, I cannot live without thee,
Or, if thou wilt go, the magnet
Of thine eye must make me follow.
All my happiness is anchored
There. Return, Daria. . . .
"The Purgatory Of St. Patrick - Act III" by Denis Florence MacCarthy
So, too, our strange unrest in this our dwelling,
The trembling that thou joinest with our mirth,
Are but thy magnet-communings compelling
Our spirits farther from the scope of earth.
"The Dark Companion" by James Brunton Stephens
We would fly with all things to the goal of their flying,
We would turn with all things to the magnetic star,
But we never can live, because of our dying,
And we never can be, for the things that we are.
"The Futile" by Genevieve Taggard
Then the few whose spirits float above the wreck of happiness
Are driven o'er the shoals of guilt, or ocean of excess:
The magnet of their course is gone, or only points in vain
The shore to which their shivered sail shall never stretch again.
"Stanzas For Music: There's Not A Joy The World Can Give" by Lord George Gordon Byron

In news:

Caddo Magnet High students meet L.A.
Moving Magnet vs Moving Coil The majority of phono cartridges are based upon one of two designs: moving magnet or moving coil.
Microsoft Surface throws it's magnetic cover into the ring.
Jetstream Europe's new "go anywhere" Magnetic Crawler M250 opens up new dimensions in cleaning and preparing steel surfaces by means of high-pressure water technology.
Your clothes will pick up the scents of your dinner as a magnet will metal shavings.
5 Questions with Allison Cush , technology teacher at Downtown Elementary Magnet Academy.
Joe Paull/jpaull@ledger-enquirer.comAllison Cush sits in the courtyard of Downtown Elementary Magnet Academy.
Keeping this idea in mind, Hibbard then used diagrams of magnetism that show attraction and picked the ones that offered a "nice balance and weight" to use.
People have tried to link the bird die-off – which is certainly unusual, though not unprecedented – to everything from a sign of biblical end times to chemical conspiracies, shifts in the Earth's magnetic core, and even proof of UFOs.
Re "Ohioans talk about politics at their own risk" (Page A18, Nov 4): I've had an "Obama 2012" magnet on my car for months.
He's destined to become a free-agent magnet.
Start with your sock drawer and other clutter magnets.
One Direction heartthrob Harry Styles a Cougar magnet.
Published Wednesday, June 6, 2012, at 4:35 p.m. Wichita's Northeast Magnet High School will offer instrumental music classes — band and orchestra — for the first time next school year.
Despite the stormy weather yesterday, the Iroquois Amphitheater was packed full with a variety of different people for the Edward Sharpe and the Magnetic Zeros show last night.
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In science:

In other words, terrestrial magnetism and solar magnetism are not electromagnetic magnetism, but gravitational magnetism.
Gauge Theory of Gravity
The spontaneous magnetization, ψ is the magnetization of the positively magnetized ground states along Hcoex .
Ground state numerical study of the three-dimensional random field Ising model
We can choose a numerical model that matches the helicity, mean magnetic fi eld, and magnetic Prandtl number conditions of clusters, in which case the spatial scale of the model magnetic field is far too small.
Thermal conduction and particle transport in strong MHD turbulence, with application to galaxy-cluster plasmas
In the static-magnetic- field approximation, our results imply that tangled magnetic fields in galaxy cluster s reduce the electron diffusion coefficient and thermal conductivity by a factor of ∼ 5 − 10 relative to their values in a non-magnetized plasma.
The divergence of neighboring magnetic field lines and fast-particle diffusion in strong magnetohydrodynamic turbulence, with application to thermal conduction in galaxy clusters
In simulations A1 and A2, the mean magnetic field is zero, and the initial magnetic field is dominated by large-sc ale fluctuations containing 10% of the maximum possible magnetic helicity.
The divergence of neighboring magnetic field lines and fast-particle diffusion in strong magnetohydrodynamic turbulence, with application to thermal conduction in galaxy clusters
Note that here we have explicitly used the coincidence of ϑ with the angle between the magnetization direction and the magnetic field; for a different orientation of the magnetic field in the ˆx- ˆy plane, Eq. (4.7) adopts a different form.
Persistent Spin Currents in Helimagnets
For a given geometrical configuration, the force between the magnets depends on the residual magnetization Br , a magnet proper parameter.
Feasibility of a magnetic suspension for second generation Gravitational Wave interferometers
It is found that the conductivity is strongly suppressed by the additional uniform magnetic field and saturates when the uniform magnetic field becomes on the order of the fluctuation of the random magnetic field.
Magnetotransport in inhomogeneous magnetic fields
Although the asymptotic exponents of the random anisotropy magnets considered here are the same as those of the random-site (diluted) Ising magnets, the approach to the asymptotical region essentially differs from the diluted magnets.
Critical slowing down in random anisotropy magnets
It is established that the evolution of the equilibrium magnetic state with growth of random exchange proceed over infinite series of first order transitions at which the number of magnetized layers and distance between them jump as well as homogeneous magnetization and susceptibility.
Glassy phases in layered Ising magnets with random interlayer exchange
The vertex diagram in presence of the magnetic field is chiefly responsible for a correction to the magnetic moment (i.e., for the anomalous magnetic moment of an electron) and other effects are of higher order.
Precision physics of simple atoms: QED tests, nuclear structure and fundamental constants
The only way to determine a value of a magnetic moment precisely (i.e., with uncertainty at the level of 0.01 ppm or below) is to measure a certain frequency proportional to the magnetic moment and applied magnetic field.
Precision physics of simple atoms: QED tests, nuclear structure and fundamental constants
If we were to introduce two more properties, say a magnetic or non-magnetic property of the balls then, observers of the two sub-urns could freely decide whether to measure colour or magnetic properties of balls they pick out, but still we could get some form of outcome dependence.
Relationalism vs. Bayesianism
Applying a magnetic field in a GM medium induces a magnetization Mtot , i.e., a net magnetic moment/volume, where Mtot = ˆxM0 + M and M0 results from H0 alone.
Observing Dark Matter via the Gyromagnetic Faraday Effect
The primordial magnetic field changes slowly with respect to the Larmor precession rate, so that the DM magnetization can track the magnetic field as the Universe evolves.
Observing Dark Matter via the Gyromagnetic Faraday Effect
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