# The direction of any magnetic field is taken to be in the direction that a compass points. Explain why this means that magnetic field lines must leave from the north pole of a permanent bar magnet and enter its south pole.

The direction of any magnetic field is taken to be in the direction that a compass points. Explain why this means that magnetic field lines must leave from the north pole of a permanent bar magnet and enter its south pole.
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The Earth calibrated compass points toward the south pole and since that is the orientation of the magnetic field that means the magnetic filed must go in the south pole. The Earth calibrated compass points away of the north pole and since that is the orientation of the magnetic field that means the magnetic filed must go out of the north pole.