what happens when yo hold south poles of a magnet toward each other?
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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!).
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Think of a magnet as a bunch of tiny magnets all aligned in the same direction. That's what gives it it's north-south poles. A piece of iron has those same tiny magnets inside, but they are not lined up. They are jumbled in all different directions and therefore the iron does not act like a magnet. But put it next to a magnet, at either pole, and all the pieces will line up with the magnet's tiny parts. Basically becoming part of the magnet. If the piece of iron stays next to the magnet long enough, the iron will stay magnetized even when moved away. But it will slowly get weaker as all its little magnet "parts" lose their alignment.
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If a bar magnet breaks into two, then there will be two magnets, each with a N and a S pole.
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Use the right hand rule, also known as the rule of thumb. If you have a wire (insulated!) with a current flowing through it, grab the wire in your right hand, with your thumb pointing in the direction that the current is flowing. Your fingers will curl around the wire in the direction of the magnetic field.\n\nIf the current alternates (periodically reverse direction) then the magnetic field also alternates. Envision it as a cylindrical zone that has the wire down its axis, and that the cylinder expands and contracts as the current of electrons increases or decreases. \n\nNow, suppose we wrap our wire around a coil form to make a coil. There is also a right hand rule, or rule of thumb, for coils. If you hold the coil (again, use insulated wire!) with your fingers wrapped around it pointing in the direction that the electron current flows, your thumb will point in the direction of the north pole of the coil.\n\nHow does that work? Remember, we are imagining the magnetic field as a cylindrical region around the wire. But the surface of the cylinder is rotating. (We'll stick with current in only one direction for the time being. It's easier to follow.) So think of the flow of the magnetic field as rotating around the wire. \n\nNow, if we wrap the wire into a coil, the rotation of the segements of the magnetic field add up in the same direction. They are working together. This is why the field is stronger inside the coil.\n\nWe should also think of the magnetic field as composed of individual lines of force that repel one another. That is why, when they exit one end of the coil and return to the other, they spread out in space. \n\nWe can see this if we hold a magnet under a sheet of paper or aluminum foil and sprinkle iron filings on top. They cluster most around the poles where the field lines are concentrated-- the field is strongest-- and more thinly around the outside of the magnet, where the field lines spread out, because the field is weaker there. This holds true for any magnet, not just electromagnets.\n\nI hope this is clear enough to help. It is a little tough trying to understand things we can't see.\n\n19 NOV 06, 1816 hrs, GMT.
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Its not so much one pole attracting the needlepoint so much as the entire magnetic metal beneath the needle aligning to the magnetic field lines*. North and South are just directional names; the most powerful magnet at the time magnetism was discovered was the earth, so naturally, they used the locations of the Earth's poles to name every magnet's pole.\n\n*Magnetic field lines are lines of force connecting the North and South poles of every magnetic object. Place a magnet under a piece of paper and sprinkle iron filings on top, and you'll be able to 'see' them. \n\nThe magnetosphere is the name given to the Earth's magnetic field, which extends into space and gives us protection against much of the charged particle radiation from the sun. This 'solar wind' interacting with our magnetosphere is what causes the auroras over the poles.
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Why do magnets work? \nMagnetism is an invisible force felt within the space around a magnet.  This space, called the magnetic field, can either attract (pull) or repel (push away) other magnets and some types of metal.\n\nAll magnets have two ends (poles).  These poles are opposites and are called the north and south poles.  Opposite poles attract, while like (similar) poles, repel.\n\nThe Earth’s core has its own magnetic field.  Magnetic north and south are near the geographic north and south poles.\n\nNASA has been experimenting with magnetic fluids for over 30 years. Magnetic fluids were made to help put fuel into a rocket engine. NASA was trying to solve the problem. of how to move fuel without gravity.  Tiny pieces of iron were put into the fuel. A magnet pulls the iron and could help get the fuel into the engine.\n\nMagnetic fluids are made by mixing pieces of metal in liquids to make a fluid that is very different from other liquids. It will stick to a magnet and can be directed by magnetic forces. Magnetic fields can shape the fluid, and magnetic fluids can change their thickness. They become hard around magnets.\n\nScientists have tried to use magnetic fluids to solve other problems. They’re used to make better computers. Scientists are still thinking of new ways to use the fluids.\n\nYou may use magnetic fluids!  Some cars have them in their shock absorbers. They are used in some buildings and bridges. The fluids help protect structures from damage from earthquakes or strong winds. There is still a lot to learn about these magnetic fluids. NASA is using the Space Station to learn more about them. They hope to find new ways to use them. \n\nKSNN thanks NASAexplores as a source of information. For more information about this topic and additional teaching resources go to http://www.nasaexplores.com
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Magnetic forces, electric forces are bi-polar: there are North and South poles on magnets, as well as positive and negative charges. As a result the forces can be attractive or repulsive.\n\nGravity is mono-polar in the sense that the force between two masses is always attractive.
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OK, so it's a little confusing to me, but apparently the magnetic pole close to the north pole is actually a south magnetic pole.  So for some strange reason, the north pole of a magnet bar will be attracted to the south magnetic pole which is located near the north pole.\n\nNorth poles on a magnet are very easily found.  When you bring a magnet up to a coil, and move the north pole back and forth, you will get a current flow in a particular direction (counter clockwise).  \n\nIf you wish you can create your own magnet.  This way you can decide which end is north, and see which end points north.  You need to pass current in a counter clockwise motion.  Use your right hand and make a thumbs up sign.  Your fingers are pointing in the direction of the current, and your thumb is pointed in the direction of the north field.\n\nBest way is to take a wire and wrap it around a bolt at least 10 times.  Current leaves a battery on the positive terminal and enters the battery on the negative terminal.  Make sure you keep track of the direction of current flow.  Then use the right hand rule I indicated above.  The thumb shows the direction of the north magnetic pole.  I wish I could draw you a diagram.
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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.
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No\n\nThe reason this has\nnever happened is due to the source of magnetic fields:  moving electric\ncharges.  When electric charges (e.g. electrons) move in circles, they\nproduce a magnetic field.  In a piece of iron, it is very easy to line up\nthese circles, getting all the little magnets to work together as one big\nmagnet.\n\nFor each of these circles, one side is the north pole and one side is the\nsouth pole.  Since each circle has two sides, each circle has a north and a\nsouth pole.  Even the smallest possible magnets (spinning electrons) have a\nnorth and a south pole.
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In North pole of Earth there is South pole of Earth's magnet and in the South pole of Earth there is North pole of Earth's magnet.
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The earth has two magnetic poles, a north pole and a south pole.\n\nThe effect of both poles can be detected by a good compass from anywhere on earth.
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Direction of Magnetic fields are in North To South direction\nIn a circular ring magnet, the direction is Clockwise in N-S Direction
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Above the line, the directon is north\n\nBelow the line, the direction is south.\n\nI think.  From what i remember, you use the right-hand rule.  Imagine pointing your right thumb toward west.  Your four fingers, will indicate the direction of the magnetic field.
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The electric and magnetic vectors are perpendicular to the direction of propagation.\n\nAlso the electric and magnetic vectors are at right angles to each other.
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The pole in the north direction of earth is the south magnetic pole of earth's magnet.\n\nThe position of magnetic pole is changing but not the pole itself. If the pole cahnges then the magnetic needle in the compass will deflect in the opposite direction.