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The direction "magnetic north" at a position on the Earth is the..
  • A
    compass North at that position corrected for variation.
  • B
    great circle between the position and the magnetic North Pole.
  • C
    direction of the horizontal component of the Earth’s magnetic field at that position.
  • D
    isogonal to the magnetic North Pole.
Magnetic North is the horizontal direction indicated by a freely suspended magnet influenced only by the Earth’s magnetic field.

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