Magnetic ( compass ) north and geographic ( true ) north are only exactly the same for a small number of places – for example, as of 2000 in the United States only those places on a line running from Wisconsin to the Gulf of Mexico .< ref > But the public may not be as informed, and think there is something mysterious about a compass " changing " across an area as large as the Triangle, which it naturally will.

# Magnetic poles ( or states of polarization at individual points ) attract or repel one another in a similar way and always come in pairs: every north pole is yoked to a south pole.

The Earth's North Magnetic Pole ( currently in the Arctic Ocean, north of Canada ) is physically a south pole, as it attracts the north pole of a compass.

** North Magnetic Pole, the shifting point on the Earth to which the " north " end of a dipole magnet points

The north pole of a magnet is the pole that, when the magnet is freely suspended, points towards the Earth's North Magnetic Pole which is located in northern Canada.

Since opposite poles ( north and south ) attract, the Earth's " North Magnetic Pole " is thus actually the south pole of the Earth's magnetic field.

Determining a property or site location based upon Magnetic North will result in inaccuracies because true magnetic north fluctuates.

** The North Magnetic Pole of planet Earth, a point where the north end of a compass points downward

Magnetic declination is the angle between magnetic north ( the direction the north end of a compass needle points ) and true north.

Magnetic variation is the angle from magnetic north to true north ( positive in clockwise, easterly direction ) and is caused by the different locations of the Geographic North Pole and the Magnetic North Pole plus any local anomalies such as iron deposits.

Magnetic declination has a very important influence on air navigation, since the most simple aircraft navigation instruments are designed to determine headings by locating magnetic north through the use of a compass or similar magnetic device.

Magnetic media, on the other hand, always carries a magnetic flux-either a " north " pole or a " south " pole.

The world's largest compass rose, drawn on the desert floor at Edwards Air Force Base in California, shows the use of degrees measured clockwise from north, North Magnetic Pole | magnetic north in this case.

* Magnetic bearing: An absolute bearing ( qv ) using magnetic north.

* Magnetic north: The direction towards the North Magnetic Pole.

East Antarctica is the larger part of the continent, both the South Magnetic Pole and geographic South Pole are situated here.

* Magnetic resonance imaging ( MRI ) MRI is a method of imaging objects that uses a strong magnetic field to detect the relaxation of protons that have been perturbed by a radio-frequency pulse.

; Magnetic resonance angiography ( MRA ): This is similar to magnetic resonance imaging.

A live frog is Magnetic levitation | magnetically levitated, an experiment that earned Andre Geim from the University of Nijmegen and Sir Michael Berry ( physicist ) | Michael Berry from University of Bristol the 2000 Ig Nobel Prize in physics.

Magnetic resonance imaging ( MRI ), nuclear magnetic resonance imaging ( NMRI ), or magnetic resonance tomography ( MRT ) is a medical imaging technique used in radiology to visualize internal structures of the body in detail.

B ( r ) is the Magnetic field strength of the planet in SI units ( B in T, μ < sub > 0 </ sub > in H / m )

Magnetic reconnection in the near-Earth magnetotail, producing a disconnected " plasmoid " One possible scenario ( the subject is still debated ) is as follows.

Magnetic tape is a medium for magnetic recording, made of a thin magnetizable coating on a long, narrow strip of plastic film.

* Magnetic levitation, a method by which an object is suspended using magnetic fields

Radboud University runs the High Field Magnetic Laboratory which is able to achieve some of the highest fields available in Europe at 33 teslas ( continuous ) and 60 teslas ( pulsed ).

The permanent moment generally is due to the spin of unpaired electrons in atomic or molecular electron orbitals ( see Magnetic moment ).

In the 1990s, researchers began to use Electroencephalography ( EEG ), Positron Emission Tomography ( PET ) and more recently functional Magnetic Resonance Imaging ( fMRI ), which is now the most widely used imaging technique to help localize personality traits in the brain.

This is a collection of fifteen selected non-fiction entries that had been published in Analog magazine over the years ; it includes five articles authored or co-authored by Zubrin, including " The Hypersonic Skyhook ", " Mars Direct: A Proposal for the Rapid Exploration and Colonization of the Red Planet " ( co-authored with David A. Baker ), " Colonizing the Outer Solar System ", " Terraforming Mars " ( co-authored with Christopher McKay ), and " The Magnetic Sail ".

Magnetic tape data storage is typically used for offline, archival data storage.

Magnetic tape is commonly housed in a casing known as a cassette or cartridge — for example, the 4-track cartridge and the compact cassette.

The treatment is often guided by Magnetic Resonance Imaging ( MRI ); the combination is then referred to as Magnetic resonance-guided focused ultrasound ( MRgFUS ).

* 1995: Madam Butterfly is the central piece of Magnetic Rose, an animated short produced by Katsuhiro Otomo and directed by Kōji Morimoto.

Magnetic mirrors play an important role in other types of magnetic fusion energy devices such as tokamaks, where the toroidal magnetic field is stronger on the inboard side than on the outboard side.

The analogy with electric dipoles should not be taken too far because magnetic dipoles are associated with angular momentum ( see Magnetic moment and angular momentum ).

Magnetic sound is no longer used in commercial cinema, but between 1952 and the early 1990s it provided the highest fidelity sound from film because of its wider frequency range and superior signal to noise ratio compared to optical sound.

Magnetic helicity is a gauge-dependent quantity, because can be redefined by adding a gradient to it ( gauge transformation ).

Magnetic reconnection in Earth's magnetosphere is one of the mechanisms responsible for the aurora, and it is important to the science of controlled nuclear fusion because it is one mechanism preventing magnetic confinement of the fusion fuel.

Magnetic levitation technology is important because it reduces energy consumption, largely obviating friction.

Remember too, that bearings and direction are given / recorded with respect to True North and to Magnetic North.

Magnetic south is the direction towards the south magnetic pole, some distance away from the south geographic pole.

Magnetic circular dichroism ( MCD ) is the differential absorption of left and right circularly polarized ( LCP and RCP ) light, induced in a sample by a strong magnetic field oriented parallel to the direction of light propagation.

The term variometer also refers to a type of variable transformer or an instrument for measuring the magnitude and direction of a Magnetic field.

* Magnetic moment () is a dipole moment measuring the strength and direction of a magnetic source.

* TM modes ( Transverse Magnetic ) no magnetic field in the direction of propagation.

The magnetic field between poles ( see figure for Magnetic pole definition ) is in the opposite direction to the magnetic moment ( which points from the negative charge to the positive charge ), while inside a current loop it is in the same direction ( see the figure to the right ).

The direction the thumb points tell us the direction current is flowing, the Magnetic field will be running 90 degrees from the current path.

It is contrasted with true north ( the direction of the North Pole ) and magnetic north ( the direction of the Magnetic North Pole ).

Magnetic grains may precipitate from a circulating solution, or be formed during chemical reactions, and may record the direction of the magnetic field at the time of mineral formation.

Magnetic fields will act in a direction perpendicular to the electron propagation, thereby conserving velocity, whereas electrostatic fields will cause electrons to move along the field gradient, which may change electron energies if the component of the direction of propagation and field gradients are not perpendicular.

Although it is known that the Signal Department of the Pacific Electric Railway developed the first " Magnetic Flagman " wigwag signal, under the direction of a Mr. Albert Hunt ( some sources list him as J. B. Hunt ), it is not known at what point the Magnetic Signal Company became a separate entity.

Magnetic anisotropy, that is the existence of a easy direction along which the moments align spontaneously in the crystal, corresponds however to " massive " magnons.

The abstract with the first tractogram appeared at the August 1992 meeting of the Society for Magnetic Resonance in Medicine, Widespread research in the field followed a presentation on March 28, 1993 when Michael Moseley re-presented the tractographic images from the Filler group — describing the new range of neuropathology it had made detectable — and drew attention to this new direction in MRI at a plenary session of Society for Magnetic Resonance Imaging in front of an audience of 700 MRI scientists.