why does magnetic declination vary with location?
358443
Natural magnetic variations and decay.  It is like waves of variation.
561324
No one possesses the right technology to destroy the earth's magnetic field.  Just leave it alone anyway it's always on the move.   Now the magnetic north pole i.e. where all compass really point is not the earth's North Pole, all compasses point to Prince something Island off the eastern side of Canada.  This is why on maps you will find what is called a declination angle to help in navigation.\nThroughout the earth's history, the pole has reversed every few million years.   Now, if a significant reversal should happen, that would be catastrophic in several ways.  Animals would no longer migrate the right direction, and all our technology used for navigation would have to be re calibrated.  The earth has a magetic field so that lethal amounts of solar radiation particles go around us instead of hitting the crust.
674108
The poles of any magnetized item will be at the extreme opposite points...in other words the positive will be as far as it can get from the negative.  In the case of a sphere this would be "top" and "bottom" not core and perimeter.  (Think of the Earth's magnetic poles!).
1128220
Earth's magnetic field is fading. Today it is about 10 percent weaker than it was when German mathematician Carl Friedrich Gauss started keeping tabs on it in 1845, scientists say. \n\nIf the trend continues, the field may collapse altogether and then reverse. Compasses would point south instead of north.
523133
Earth's magnetic field, among other things.
42983
It doesn't matter if you are in the East or West. If you can, try to get your bed's head & foot pointing from North to South. This way the lines of your personal magnetic field (the aura) run parralel with that of the Earth.Using this method, there won't be much 'cross-grain' interference. I know it works for me!!
317463
When liquid magma comes out of the earths crust at the mid-oceanic ridge, it cools rapidly forming crystals. These crystals have magnetic properties that align the crystal according to the earths magnetic field at the time they cooled, similar to how a compass needle points north, the magnetism in the crystal indicates which direction was north when the crystal was formed.\n\nHowever, the direction that is north today, was not always north in the past, in fact many times in geologic history, the north and south poles were reversed entirely. This is reflected in the "magnetic bands" found in rock on the ocean floor.\n\nSo, if you imagine the Atlantic Ocean between the U.S. and Europe, there is a mid-ocean ridge between the two. If the plates never moved, then the magma coming out of this ridge would just pile up, but instead, this is the "engine" that moves the plates away from one another. As you move from the mid-ocean ridge towards the continents, the crystals in the rock have different magnetic orientations that show these flip-flops of the earths magnetic field through geologic history. Because this material originated at the mid ocean ridge, but is now closer to the continents, it shows that the earths crust, the floor of the ocean, is moving AWAY from the mid-ocean ridge and TOWARDS the continents.\n\nThere are a lot of  diagrams that would probably help you understand this better. CHeck out a geology book, or look online.\nGood Luck!
148700
Typically this refers to magetic fields.  If you align a large magnet (like a NMR - nuclear magnetic resonance instrument) protons or electrons (ESR - electron spin resonance) are aligned to a certain angle and the like.  Once the magnet is removed, the electrons and protons can start "precessing" and this is recorded via the sound it emits and it is then Fourier transformed into a typical spectra that can be interpreted. \n\nAtoms in degenerate orbitals will align under a big enough magnetic field.
387173
Magnetic flux and electric flux are always linked with each other.\n\nIf a magnetic flux changes in a certain region in space, a rotational electric field is produced.\n\nA varying magnetic field is inseparable from an electric field.\n\nThe division of electric fields into electric and magnetic fields is a relative matter.\n\nFrom one point there is only a magnetic field in space. From another view point in addition to the magnetic field there is an electric field. \n\nThe converse is also true.\n\nIf an observer in one system of coordinates finds only an electrical field present, then an observer in another inertial system will find that both an electrical field and magnetic field exist.
574455
South Magnetic Pole\nIs the point on the Earth's surface where the direction of the Earth's magnetic field is vertically upwards. The magnetic dip, the angle between the horizontal plane and the Earth's magnetic field lines, is 90° at the magnetic poles. The south magnetic pole is not fixed and its position moves about 5 kilometres a year presently in a north to northwesterly direction. The location of the south magnetic pole as at February 1998 was 64.59° S and 138.53° E.\n\nGeomagnetic Pole\nEither of two points of intersection of the surface of the Earth with the extended axis of a magnetic dipole which is assumed to be located at the centre of the Earth and approximates the source of the Earth's magnetic field. It should not be confused with the magnetic pole which relates to the actual magnetic field of the Earth. The south geomagnetic pole is at 78° 30' S and 111° E which is near Russia’s Vostok Station.
89051
On average, about once every 250,000 years or so Earth's two magnetic poles switch---the north magnetic pole becomes the south magnetic pole, and the south magnetic pole becomes the north magnetic pole. This means, among many other things, that compasses would all point south instead of north.\n\nScience knows that these pole reversals do happen. Some ancient rocks tell the story. In the far distant past these rocks were molten. At those times their interior materials would align themselves to Earth's magnetic field, much the way an electromagnet will. Careful analysis shows that the magnetic lines of force imbedded in these rocks often were directly opposite to Earth's present magnetic field.\n\nThe last pole reversal happened some 700,000 years ago, so we're sort of overdue for another one.
356086
it depends whether u live north or south of the equator. the culprit is called coriolis force. it is proportional to omegaXv where omega is the eaths angular momentum. since its a cross product and v is different in north and south. the direction (clockwise or anti) is thus different.
698855
The directional North pole of the earth is a magnetic south pole, this is because the north end of a compass points north, and opposites attract, therefore north is...south.\n\nMagnetic lines go from south to north i think, sorry havn't taken electricity/mag class in so long...\n\nanyways, if my thining is correct than it would point towards the directional south\n\ni'd choose "down"
341358
The north and south poles will be at opposite ends of the object and will lie along the axis of the applied magnetic field that was used to produce the ring or marble magnet.\n\nThe poles in the case of the ring can be produced  on a line (axis) perpendicular to the ring (circle), or it can be produced along a line (axis) that passes through the ring material (the circle). Using the iron filings and multiple orientations will assist you in determining the general direction of the axis of the field, but will not tell you precisely where the poles are.
1081450
yes, assuming the poles were damn near touching. as for the distance, magnetic force vs distance is an exponential curve so technically the force never diminishes. you have to set a lower threshold to say that the force has diminished once below that threshold, e.g <1lb.
840206
It points straight down (if it is mounted so that it can do this) at the magnetic pole. The magnetic and geogrpahical poles do not coincide.
1052897
Yes, there is a complex relationship.\n\nThe poles of the Earth's magnetic field actually change their locations across geological time.\n\nHowever, it's speculated that the Earth's magnetic field may be caused by a flow of liquid iron in the Earth's outer core, which might be affected in part, but not only, by Earth's rotation.