North poles attract south poles but north poles repel

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came with two sides a north pole and a south pole. North poles attract south poles. But north poles repel north poles and south poles repel south poles. With the aid of compasses, magnetic field lines were mapped for simple shapes of magnets. It was defined that magnetic field lines exited the north end and entered the south end.
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History of Magnets Magnetic field lines are actually easier to visualize than electric field lines. Just put some iron filings next to a magnet and they will align themselves with the magnetic field.
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“bar magnet on compass array” (Source: Dayna Mason) Mag. field of magnet (1)
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“Magnetism pictures—a set on Flickr” (Source: Dayna Mason) Mag. field of magnet (2)
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“magnetic field lines” (Source: Dayna Mason) N,S = source, sink (Closed loops)
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Direct Model Source N-S test n-s F exerts on attractive (N-s, S-n) (N-n, S-s) repulsive dir. =
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n s s n S N N S S N N S n s s n Source magnet Test magnet (repel) (attract) (repel) (attract)
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“Paperclips on Magnet” (Source: Robert Fornal) Ferromagnetism
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“magnetic field lines with compass needles” (Source: Dayna Mason) F on n,s n s Obeys/disobeys B field
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History of Magnets It was later discovered that inside the physical magnet the magnetic field lines actually moved from south to north.
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