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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.
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Magnetic and compass
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.
Magnetic north is of interest because it is the direction indicated as north on a properly functioning ( but uncorrected ) magnetic compass.
The Magnetic North Pole wanders, but slowly enough that a simple compass remains useful for navigation.
** 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 deviation is the angle from a given magnetic bearing to the related bearing mark of the compass.
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.
To simplify this task a compass card is added to the RBI to form a " Radio Magnetic Indicator " ( RMI ).
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 deviation is the error induced in a compass by local magnetic fields, which must be allowed for, along with magnetic declination, if accurate bearings are to be calculated.
Magnetic compass adjustment and correction is one of the subjects in the examination curriculum for a shipmaster's certificate of competency.
Magnetic and north
# 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.
** 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.
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 media, on the other hand, always carries a magnetic flux-either a " north " pole or a " south " pole.
Magnetic and geographic
East Antarctica is the larger part of the continent, both the South Magnetic Pole and geographic South Pole are situated here.
Magnetic south is the direction towards the south magnetic pole, some distance away from the south geographic pole.
Magnetic and true
Declination converts between true and magnetic bearings: True Bearing equals Magnetic Bearing plus Magnetic Declination.
It is contrasted with true north ( the direction of the North Pole ) and magnetic north ( the direction of the Magnetic North Pole ).
* Magnetic Resonance Imaging ( MRI ) or Computer Tomography ( CT ) Scan to determine true sparing of quadriceps ;
Magnetic and are
* Magnetic phonograph cartridges, which have a mu-metal case to reduce interference when LPs are played back
Magnetic dipoles are best represented as loops of current but resemble positive and negative ' magnetic charges ', inseparably bound together, having no net ' magnetic charge '.
Magnetic pressure should tend to remove field concentrations, causing the sunspots to disperse, but sunspot lifetimes are measured in days or even weeks.
Magnetic fields are used for confinement since no solid material could withstand the extremely high temperature of the plasma.
Magnetic fields are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin.
* Magnetic core, in electricity and electronics, ferromagnetic material around which wires are wound
Remember too, that bearings and direction are given / recorded with respect to True North and to Magnetic North.
Magnetic fields are ubiquitous among stars, yet we do not understand precisely why, nor have we fully understood the bewildering variety of plasma physical mechanisms that act in stellar environments.
Magnetic field # Magnetic field lines | Magnetic field lines of a solenoid electromagnet, which are similar to a bar magnet as illustrated above with the iron filings
Magnetic ferrofluids, although they are made of tiny ferromagnetic particles suspended in liquid, are sometimes considered paramagnetic since they cannot be magnetized.
Magnetic field lines, represented as arrows, are excluded from a superconductor when it is below its critical temperature.
Magnetic moment displacement is ostensibly the main disturbance, yet submarines are detectable even when oriented parallel to the Earth's magnetic field, despite construction with non-ferromagnetic hulls.
Magnetic fields are produced on poles, and these can be salient poles where they are driven by windings of electrical wire.
Magnetic gradiometers are pairs of magnetometers with their sensors separated, usually horizontally, by a fixed distance.