what is magnetic field lines ?
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Magnetic field lines are imaginary lines around the magnet. The magnitude of a field is indicated by its line's density. Near to South and North Pole of a magnet, the magnetic field is stronger and will get weaker when it moves away from the poles.
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Magnetic field lines are defined to have the direction that a small compass points when placed at a location. (a) If small compasses are used to map the magnetic field around a bar magnet, they will point in the directions shown: away from the north pole of the magnet, toward the south pole of the magnet.
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