File:Openstax college-physics 22.15 magnet-field-lines.jpg

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English: 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. (Recall that the Earth’s north magnetic pole is really a south pole in terms of definitions of poles on a bar magnet.)
(b) Connecting the arrows gives continuous magnetic field lines. The strength of the field is proportional to the closeness (or density) of the lines.
(c) If the interior of the magnet could be probed, the field lines would be found to form continuous closed loops.
The image was modified for an accurate representation of the shape of field lines.
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Source OpenStax College Physics
Author OpenStax

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